Question: A researcher would like to examine the effects of humidity on eating behavior. It is known that laboratory rats normally eat an average of m = 21 grams of food each day. The researcher selects a random sample of n =16 rats and places them in a controlled atmosphere room in which the relative humidity is maintained at 90%. The daily food consumption scores afor the rats are as follows:

14, 18, 21, 15, 18, 18, 21, 18

16, 20, 17, 19, 20, 17, 17, 19

a. Can the researcher conclude that humidity has a significant effect of eating behavior? Use a two-tailed test with a = .05.

b. Compute the estimated d and r squared to measure the size of the treatment effect.