# Hypothesis Testing & Cohen's d: Humidity & eating behaviour

A research would like to examine the effects of humidity on eating behavior. It is known that laboratory rats normally eat an average of Âµ = 21 grams of food each day. The research 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 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 on eating behavior? Use a two-tail test with  = .05.

b. Compute the estimated Cohen's d and r 2 to measure the size of the treatment effect.

https://brainmass.com/statistics/hypothesis-testing/hypothesis-testing-cohen-s-d-humidity-eating-behaviour-310957

#### Solution Summary

The solution provides step by step method for the calculation of testing of hypothesis, Cohen's d and effect size. Formula for the calculation and Interpretations of the results are also included.