What Are t-Tests? - Assessing Statistical Differences Between Groups


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When are degrees of freedom lost?

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1. Identify the statement that appropriately describes the null hypothesis:


Some high school students were divided into two groups, group A and group B, and given the same test.

Group A consisted of 6 students and the average score was 12 with a standard deviation of 2. Group B consisted of 8 students and the average score was 11 with a standard deviation of 3. The variability within the groups is:

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About This Quiz & Worksheet

With this quiz/worksheet combo you will be examined principally on what t-Tests look for, their hypotheses, and standard deviation.

Quiz & Worksheet Goals

Specifically you will be assessed on:

  • The t-value
  • The purpose of the t-test
  • Degrees of freedom lost
  • The null hypothesis
  • The calculation of standard deviation

Skills Practiced

  • Information recall - access the knowledge you've gained regarding quantifiable differences between groups
  • Distinguishing differences - compare and contrast topics from the lesson, such as null hypotheses
  • Reading comprehension - ensure that you draw the most important information from the related lesson on t-Tests

Additional Learning

Want to learn more about t-Test? Take a look at the related lesson by the name of What Are t-Tests? - Assessing Statistical Differences Between Groups. In this lesson you will learn more about:

  • Standard deviation
  • Alternative and null hypotheses
  • Degrees of freedom