A researcher designs a study to determine whether female preschoolers prefer sweetened or unsweetened cereal. The researcher uses a box of sweetened colorful cereal and a box of unsweetened tan colored cereal. The research finds that the group of preschoolers ate more of the sweetened colorful cereal and therefore prefers the sweetened cereal. Which two variables are confounded in this experiment?
a. color of the cereal and children's gender
b. color of the cereal and sweetness of the cereal
c. sweetness of the cereal and amount of eating
d. children's gender and amount of eating
Question 2
If you are dealing with raw data and you can assume a ____, you can predict the intervals within which 68, 95, and 99 percent of your cases would be expected to fall if you know the mean and standard deviation of a sample.
a. normal distribution
b. random sample
c. representative sample
d. bivariate distribution
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