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1. 39 subjects were tested in this simple one-way ANOVA.

   The df for F distribution is (treatment df, error df)

   Using given information

   Treatment df = 7

   Error df = 31

   Total df= 7+31 = 38

   Again, total df = N-1, N= number of subjects tested

   Then, N-1 = 38

   => N= 39

   One-way ANOVA is typically used when there is a single independent variable or factor and the goal is to see whether variation or different levels of that factor have a measurable effect on the dependent variable.

   The t-test is a method of determining whether two populations are statistically different from each other, and ANOVA determines whether three or more populations are statistically different from each other.

   Learn more about one-way ANOVA here: https://brainly.com/question/24157862

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