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We conduct a dependent sample t-test using a pre /post design. At our pretest assessment, 10 participants complete our questionnaire. At our post test assessment,

We conduct a dependent sample t-test using a pre /post design. At our pretest assessment, 10 participants complete our questionnaire. At our post test assessment, the same 10 participants return and complete the follow up questionnaire. What are our degrees of freedom for our test?

18

19

10

9

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