A researcher would like to examine the effect of humidity on eating behavior. It is known that laboratory rats normally eat an average of μ = 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 for the rats are as follows:
14, 18, 21, 15, 18, 18, 21, 18
16, 20, 17, 19, 20, 17, 17, 19
a. In words and symbols, state the null hypothesis and the alternative hypothesis using a two-tailed test.
b. Find the mean, range, variance, and standard deviation for food consumption.
c. Conduct the appropriate statistical test to determine whether the researcher can conclude that humidity has a significant effect on eating behavior. Use a two-tailed/bidirectional test with α = .05. What do you conclude? Be sure to include the statistical sentence