When hypothesis testing with a sample of two or more,the formula for figuring your sample's score on the comparison distribution is

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The items below (# 17 - 21)are based on the following scenario. An experimental psychologist is interested in whether the color of an animal's surroundings affects learning rate.He tests 16 rats in a box with colorful wallpaper.The average rat (of this strain)can learn to run this type of maze in a box without any special coloring in an average of 25 trials,with a variance of 64,and a normal distribution.The mean number of trials to learn the maze,for the rats tested with the colorful wallpaper,is 11.

When Hypothesis Testing with a Sample of Two or More,the