This video provides a comprehensive guide to data science, covering topics such as variables, measurement, and statistics. The video covers four different types of measured data: nominal, ordinal, interval, and ratio. The video also discusses ordinal data and explains how it is different from nominal data. Finally, the video covers frequency distribution, which is important for understanding histogram.
00:00:00 This YouTube video covers the basics of statistics, including how to measure central tendencies and dispersion, and how to create graphs and charts. The video also explains how to perform hypothesis testing and determine whether a distribution is normal.
00:05:00 Descriptive statistics consists of organizing and summarizing data. Inferential statistics is a technique that uses data to form conclusions.
00:10:00 Krish Naik discusses the different types of sampling techniques and how they are used to collect data. He explains that simple random sampling is the most commonly used technique.
00:15:00 This video explains the different sampling techniques available to data scientists. Simple random sampling is used for simple data collection, while stratified sampling is used for more complex data. Systematic sampling is used when the data scientist is not near the population they are sampling from.
00:20:00 In this video, Krish Naik explains the different types of sampling and how they are used in surveys. He then goes on to explain how convenient sampling works, and how it can be used in surveys related to data science. Finally, he discusses variables and how they can be used in surveys.
00:25:00 In this one-hour video, Krish Naik introduces the concept of variables and demonstrates how quantitative and qualitative variables differ. He then goes on to explain the properties of each kind of variable. He concludes the video by giving examples of variables.
00:30:00 This YouTube video provides a comprehensive guide to data science, covering topics such as variables, measurement, and statistics. The video covers four different types of measured data: nominal, ordinal, interval, and ratio. The video also discusses ordinal data and explains how it is different from nominal data. Finally, the video covers frequency distribution, which is important for understanding histogram.
00:35:00 This video introduces the concept of frequency distribution, and then goes on to show how to create a bar chart and histogram from data. It also provides an example of how to use cumulative frequency to calculate the total number of flowers in a data set.
00:40:00 This video provides statistics on data sets in six hours. The first topic discussed is arithmetic mean, which is used to find the average of a population or sample. The second topic is measure of central tendency, which is used to describe the average of a set of data. The third topic is measure of dispersions, which is used to describe the spread of data. The fourth topic is z score, which is used to measure the difference between two data sets. The fifth topic is standard normal distribution, which is used to describe data that follows a normal distribution. The sixth and final topic is arithmetic mean, measure of central tendency, and z score.
00:45:00 This 1-hour video covers the basics of data science, including the meanings of the terms "average" and "mean," and the calculation of the median. The video then goes on to discuss the calculation of the mode, which is the most common value in a data set. Finally, the video covers the removal of outliers from data sets and explains how to use percentile charts to make this process easier.
00:50:00 In this six-hour video, Krish Naik discusses the use of mode as a measure of central tendency. He explains that mode is most useful when the data set contains many outliers.
00:55:00 In this video, Krish Naik covers the basics of data science, including discussing dispersion and variance. He also covers how to calculate these measures for data sets. Finally, he discusses two common interview questions – population variance and sample variance.
This YouTube video by Krish Naik provides a complete overview of data science, including definitions of percentile and the meaning of percentile ranking. It explains how to calculate percentile rankings for specific values using a simple formula, and provides an example of how percentile rankings can be used to understand the distribution of data.
01:00:00 The video discusses the importance of variance in data. It explains that when standard deviation is high, dispersion becomes high, meaning that there are more values within the data set. The video then goes on to show an example of how to calculate variance.
01:05:00 The mean and standard deviation are important statistical measures used in data analysis. The mean is the most common measure of central tendency and is the average of a set of data. The standard deviation is a measure of variability and tells you how spread out the data is. Outliers are data points that are far from the mean or standard deviation. Percentiles are a way of measuring how spread out data is and percentile ranks are used to find outliers.
01:10:00 This video provides a complete overview of data science, including definitions of percentile and the meaning of percentile ranking. It explains how to calculate percentile rankings for specific values using a simple formula, and provides an example of how percentile rankings can be used to understand the distribution of data.
01:15:00 This video explains how to use the five number summary to identify outliers in a data set. The video explains the concepts of first quartile, median, first number, second quartile, and third quartile. It also explains how to calculate the index position, lower fence, and interquartile range.
01:20:00 In this video, Krish Naik covers the concepts of the lower fence and higher fence, variance, and outliers. He then explains how the box plot can be used to identify outliers.
01:25:00 The author introduces Gaussian and normal distributions, and discusses how they are used to visualize data. He then goes on to discuss binomial, Bernoulli, and Poisson distributions. The last part of the video covers how to create histograms, probability density functions (PDFs), and smooth curves in histograms to create a bell curve.
01:30:00 The video describes the symmetrical, bell-shaped distribution of data points, and the important concepts of the 68-95-99.7 rule and empirical formula. It explains that, for a normal distribution, 68% of the data points lie within the first standard deviation, 95% within the second, and 99.7% within the third standard deviation.
01:35:00 This YouTube video discusses standard deviation, how it is used to determine where data falls within a bell curve, and how it can be used to calculate z scores. The video also explains how z scores can be used to determine how far data is from the mean.
01:40:00 This YouTube video explains how to apply the z score to data in order to convert it into a standard normal distribution. This is useful for machine learning and other data-related tasks.
01:45:00 The normal distribution is a process that is used to standardize data. Standardization is important because it allows for comparisons between datasets that have different levels of measurement, including numeric and categorical data. Normalization is a process that is used to convert a distribution into a standard normal distribution. Normalization is important because it allows for comparisons between datasets that have different levels of measurement, including numeric and categorical data. The z score is a statistic that is used to compare data. The z score is calculated by dividing the sum of the squares of the differences between the data points and the mean of the data points by the standard deviation of the data points. The z score is a measure of how spread out the data points are. The z score is used to compare data, to measure the deviation of data from the mean, and to identify outliers. The z score is also used to determine if a data set is normal. The application of the z score to data sets is called normalization.
01:50:00 In this video, Krish Naik explains how to calculate the standard deviation for data science. He starts with a discussion of the not out rule and how it affects average score. He then calculates the standard deviation for rishabh month average score and team average score and demonstrates how it changes based on the not out rule. He concludes the video by showing how to calculate the standard deviation for final score and team final score.
01:55:00 This video provides a brief introduction to the concept of standard deviation and its application to data science. It provides an example of a problem statement and shows how to use z score to find the percentage of scores that fall above a given value.
This video provides a comprehensive guide to data science, covering topics such as probability, conditional probability, and hypothesis testing. It also outlines an example problem and provides the solution. This video is essential for anyone looking to learn data science.
02:00:00 The author provides a brief overview of data science, including the three types of z score, and demonstrates how to calculate the area of a body curve using a z table and the left and right tail z tables.
02:05:00 In this six-hour video, Krish Naik explains how to calculate z scores and their uses in statistics. He covers topics such as standard deviation and mean, as well as how to find z scores for specific ranges of values. He also provides a link to a Google Collaborative Pro tool that allows users to calculate z scores.
02:10:00 In this 6-hour video, Krish Naik teaches how to compute mean, median, mode, and risk plots for data sets, as well as the pdf function. He also shows how to construct a count plot for a data set.
02:15:00 In this six-hour video, Krish Naik discusses how to calculate percentile and z-score, as well as how to determine if data is an outlier.
02:20:00 The author discusses how to implement a detection function for outliers in data using Python. The function looks for data points that fall away from the mean and standard deviation by a certain amount, and assigns a Z score to each point. Outliers are then flagged and displayed in a list.
02:25:00 In this video, Krish Naik explains how to use z score to identify outliers in data. He starts by sorting the data, calculating q1 and q3, and finding the lower fence and higher fence. Next, he calculates iqr, which is the third step in the process. If all goes well, the lower fence and higher fence will be equal, and the iqr will be equal to q3 minus q1.
02:30:00 This video explains how to calculate probability, and provides several examples. The video finishes with a discussion of the addition rule.
02:35:00 This YouTube video provides a complete overview of the statistical concepts necessary for data science, including the addition rule and mutual exclusive events.
02:40:00 The three rules of probability are addition, multiplication, and division. These three rules can be used to solve problems involving events that are either independent or non-independent. In the case of independent events, each occurrence has an equal probability. However, in the case of non-independent events, one occurrence may impact the outcome of another.
02:45:00 This video provides a comprehensive guide to data science, covering topics such as probability and conditional probability. It outlines an example problem, which is of a dependent event, and provides the solution.
02:50:00 This YouTube video provides statistics on data science in 6 hours. The video covers probability, conditional probability, and biased theorem. It also discusses permutation, combination, and Permutation Formula.
02:55:00 This video discusses the various statistics used in data science. It covers hypothesis testing, confidence intervals, and significance values. It also discusses how to perform a fair coin experiment.
This video provides a complete overview of statistics for data science in just 6 hours. It covers topics such as null and alternate hypotheses, standard deviation, confidence intervals, and t tests. This video is a great resource for anyone looking to learn more about statistics for data science.
03:00:00 The author discusses how to perform an experiment to determine whether a coin is fair or not. He defines the null hypothesis (that the coin is fair) and the alternate hypothesis (that the coin is unfair). He also discusses the concept of standard deviation and how it affects the outcome of the experiment.
03:05:00 This video explains how to calculate the significance value of a statistical test, and presents an example of a 95% confidence interval. The significance value indicates the level of confidence in the results of the test. If the test results fall within the confidence interval, it is considered to be statistically significant. If the results fall outside of the confidence interval, it is not considered to be statistically significant.
03:10:00 In this video, Krish Naik explains the concepts of type 1 and type 2 error, one-tailed and two-tailed tests, and confidence intervals. He goes on to discuss how to calculate these values in the event that an alpha value is given. He also explains how to make decisions based on these calculations.
03:15:00 In this video, Krish Naik discusses the three types of errors that can be made when performing statistical tests: type one error, type two error, and type three error. He explains that in the case of a type one error, you reject the null hypothesis when in reality it is true, and this is a bad decision. He then goes on to discuss the third outcome, which is when you accept the null hypothesis when it is actually false. This is also a bad decision, and is called type two error. He finishes the video by discussing the confusion matrix, which is a tool used to define true positive, true negative, and false positive values for a test.
03:20:00 The video presents complete statistics for data science in 6 hours. It explains that a new college had a placement rate of 88% with a standard deviation of four percent, which means the college has a different placement rate than 85% (the original placement rate). In this case, the question becomes a two-tailed test, and the result is that the new college falls within the 95% confidence interval.
03:25:00 In this video, Krish Naik explains how to calculate a confidence interval for a mean, point estimate, and margin of error. He also discusses how to use a problem statement to determine the value of a statistic.
03:30:00 In this video, Krish Naik explains how to calculate a confidence interval for a mean using a z test. He provides an example of a problem statement and provides the information needed to calculate the confidence interval. Finally, he explains how the confidence interval is linked to the alpha value, and how to use the z test to determine the z score.
03:35:00 The presenter discusses the concept of population standard deviation and how it can be used to calculate confidence intervals for a data set. He provides an example of how to solve a problem involving a data set and discusses the use of alpha as a confidence interval parameter. He also provides a lower and upper bound for the confidence interval, and explains how to decide when to accept the null hypothesis.
03:40:00 In this video, Krish Naik explains how to use the t test to analyze a situation in which the population standard deviation is not given. In this particular scenario, he uses the z test.
03:45:00 This video discusses the statistics of data science, including one-sample z tests and the confidence interval. The presenter explains that the null hypothesis is that the mean of the data is equal to 100, and the alternate hypothesis is that the mean is not equal to 100. The presenter also discusses the alpha value, which indicates the level of confidence in the results of the z test.
03:50:00 The fourth step in the data science process is to state your decision rule, which in this case is that a medication's effect on intelligence can be classified as either positive or negative. The z test is used to calculate a value within a specific range, and the test statistics is t.
03:55:00 In this video, Krish Naik explains the standard error and how it relates to data science. He then goes on to explain the t test, which is used to test whether a mean is different from a population mean. He also explains one sample t tests, which are used to test whether a mean is different from a specific value.
This video is an introduction to statistics for data science. It covers the basics of hypothesis testing, chi-square tests, t-tests, and covariance. The video also provides examples of how to use these concepts in real-world scenarios.
04:00:00 The video discusses statistics, specifically the use of t tests, in data science. It provides a brief overview of the t test, its formula, and how to compute the test statistic. It then discusses a real-world problem and presents an example of how to use hypothesis testing to solve it.
04:05:00 In this 6-hour video, Krish Naik covers the statistics of data science, including chi-square, t-test, and f-test. He also discusses the chi square test's use in assessing population proportions that have changed over time. Finally, he demonstrates how to perform a chi square test.
04:10:00 In this video, Krish Naik explains how to calculate the percentage of individuals in a population based on data from 2000 samples. Naik points out that the observed percentage differs greatly from what is expected, indicating that the population may have changed over the last 10 years.
04:15:00 In this video, Krish Naik explains the three steps of a chi square test: defining the null hypothesis, calculating the chi square test statistic, and interpreting the decision boundary. He also discusses the significance of the chi square test statistic.
04:20:00 This YouTube video explains how to use a non-parametric statistical test, chi-square, to determine if a new drug affects IQ levels. The z-test is used to compare the observed IQ levels with the expected IQ levels, and if the observed IQ levels are not within the expected IQ levels, then the null hypothesis is rejected.
04:25:00 The video discusses the concept of covariance, and how it is used to quantify the relationship between two variables. It also provides an example of how covariance is calculated.
04:30:00 This video explains the basics of data science, including the correlation between x and y. It also explains the difference between covariance and correlation.
04:35:00 This video discusses the correlation between data sets. It explains that Pearson correlation measures linear relationships between data points, while Spearman rank correlation captures non-linear relationships. It also shows how to calculate Spearman rank correlation.
04:40:00 This video provides statistics on data science concepts, including covariance of ranks, Spearman rank correlation, and t test. The video also demonstrates how to do a t test.
04:45:00 This video explains the concepts of statistics and data science, and provides an example of how to use a t test to determine whether a population mean is closer to a specific value than to the average. The video also discusses how to use correlation to determine the relationship between two variables.
04:50:00 This video explains the relationship between p value and significance value, and how to calculate them. It also covers the central limit theorem and its applicability to statistical testing.
04:55:00 In this video, Krish Naik discusses the statistical significance of a sample's mean and standard deviation. He then presents a problem and shows how to calculate the z-test statistic and decision boundary. Finally, he explains how to interpret the p-value associated with the z-test.
This YouTube video provides a brief introduction to various statistics concepts used in data science. The topics covered include the p value, the null hypothesis, confidence intervals, the mean, standard deviation, and the binomial distribution. The video also provides code to convert data into a normal distribution.
05:00:00 In this six-hour video, Krish Naik explains how to calculate the p value for a test that tests the null hypothesis that two groups have the same mean. He also discusses how to reject the null hypothesis if the p value is greater than the significance value.
05:05:00 This YouTube video explains the use of z-scores in data science, and demonstrates how to calculate the p-value for a hypothesis. The video also discusses the use of a confidence interval to determine the likely age of a college student population.
05:10:00 This video discusses the statistics of data science, including the mean, standard deviation, and n value. It also discusses the two-tailed and one-tailed testing of hypotheses. The p value is determined for a two-tailed test and is less than significance. The null hypothesis is then rejected with a log normal distribution.
05:15:00 This video provides a brief introduction to the Bernoulli and binomial distributions, and discusses how they are used when studying probability. The video also provides an example of how a probability density function (PDF) and probability mass function (PMF) can be used to calculate the probability of an event.
05:20:00 The video discusses the probability distribution called the binomial distribution. The binomial distribution is used to calculate the probability of success for a given number of trials. The video also discusses the pareto distribution, which is a distribution used to calculate the percentage of success for a given number of items. Finally, the video provides code to convert data into a normal distribution.
05:25:00 This YouTube video demonstrates how to perform various data science transformations, including a q-q plot, logarithmic transformation, reciprocal transformation, and box-cox transformation. The video also explains the central limit theorem and how it can be used to predict the distribution of a sample mean.