Statistical & Hypothesis Tests: Performing Two-sample T-tests & Paired T-tests

Statistics    |    Expert
  • 14 videos | 2h 5m 38s
  • Includes Assessment
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In situations where two independent samples are drawn from different populations or where paired samples are available, such as in a before-after scenario, two-sample and paired T-tests are needed, respectively. Use this course to explore how two-sample T-tests can be used to test the null hypothesis that two independent samples have drawn from populations with equal means. You'll examine type I and type II errors and the use of paired samples T-tests. By the time you finish this course, you will be able to test whether two samples - either drawn independently or explicitly linked - are drawn from populations with equal means.

WHAT YOU WILL LEARN

  • discover the key concepts covered in this course
    recall the assumptions of the two-sample T-test
    use Levene’s test to check for equal variances
    use the two-sample T-test to compare means
    recognize when the Welch’s T-test should be used
    use the Welch’s T-test to compare means
    describe type I and type II errors
  • outline the relationship between type I errors and alpha levels
    outline the relationship between type II errors and alpha levels
    set up and visualize data for the paired difference T-test
    perform the paired T-test on paired samples
    use the paired T-test to compare before and after values
    perform paired T-tests with varying outcomes for the null hypothesis
    summarize the key concepts covered in this course

IN THIS COURSE

  • 1m 46s
  • 11m 12s
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    3.  Performing Levene's Test
    7m 27s
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    4.  Comparing Means Using the Two-sample T-test
    8m 52s
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    5.  Understanding Welch's T-test
    12m 8s
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    6.  Comparing Means Using Welch's T-test
    9m 18s
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    7.  Understanding Type I and Type II Errors
    9m 19s
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    8.  Exploring Type I Errors and Alpha Levels
    10m 44s
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    9.  Exploring Type II Errors and Alpha Levels
    10m 35s
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    10.  Introducing the Paired Difference T-test
    11m 15s
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    11.  Preparing Data for the Paired T-test
    11m 2s
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    12.  Using Paired T-tests
    10m 28s
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    13.  Comparing Before and After Data with Paired T-tests
    9m 31s
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    14.  Course Summary
    2m 2s

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