A medical researcher wondered if there is a significant difference between the mean birth weight of boy and girl babies.A random sample of babies' weights (pounds)showed the following. How many degrees of freedom would be used to test for a zero difference in means?
A) 4
B) 8
C) 10
D) Must know $\alpha$to say.

Question

Quizplus · Accepted Answer

The degrees of freedom for a two-sample t-test is calculated as the sum of the sample sizes of both groups minus 2. If the sample sizes are not provided, the degrees of freedom cannot be determined. However, assuming equal sample sizes of 5 for each group (as implied by choice B), the degrees of freedom would be 5 + 5 - 2 = 8.

A Medical Researcher Wondered If There Is a Significant Difference α\alphaα

A Medical Researcher Wondered If There Is a Significant Difference $\alpha$