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An independent-measures research study uses a total of 40 participants to compare two treatment conditions. What is the [tex]df[/tex] value for the [tex]t[/tex] statistic for this study?

A. 18
B. 19
C. 38
D. 39

Sagot :

GinnyAnswer
To determine the degrees of freedom (df) for an independent-measures t-test, we can use the formula:

[tex]\[ \text{df} = N - 2 \][/tex]

where \( N \) is the total number of participants in the study.

In this case, the total number of participants ( \( N \) ) is given as 40. Applying the formula, we get:

[tex]\[ \text{df} = 40 - 2 \][/tex]

[tex]\[ \text{df} = 38 \][/tex]

Therefore, the correct df value for the t statistic for this study is:

C. 38
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