1. Identify whether each of the following is a matched pairs or a two sample t-test. Justify your decision. a. Does reading on a light-emitting e-reader at bedtime increase how long it takes to fall asleep? A sample of 12 adults slept in the lab on two different nights. In random order,subjects read for 30 minutes in a print book one night and with a light-emitting e-readerthe other night. How long (in minutes) it took subjects to reach a deep sleep stage was recorded. The researchers compared the difference in the amount of time it took theperson to reach deep sleep. b. A diet has been developed for raising cows. Two random samples of size 9 are independently selected, and one is given the standard diet while the other is given the new diet. After 18 weeks, the weight gain was measured for each cow.

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Author:Amos Gilat
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1. Identify whether each of the following is a matched pairs or a two sample t-test. Justify your decision.
a. Does reading on a light-emitting e-reader at bedtime increase how long it takes to fall asleep? A sample of 12 adults slept in the lab on two different nights. In random order,subjects read for 30 minutes in a print book one night and with a light-emitting e-readerthe other night. How long (in minutes) it took subjects to reach a deep sleep stage was
recorded. The researchers compared the difference in the amount of time it took theperson to reach deep sleep.


b. A diet has been developed for raising cows. Two random samples of size 9 are independently selected, and one is given the standard diet while the other is given the new diet. After 18 weeks, the weight gain was measured for each cow.

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