A statistician wants to know whether newborn baby boys or newborn baby girls cry more. Consider the following scenarios. I. The statistician randomly selects 100 sets of newborn baby twins that include a boy and a girl. She records how much time each baby spends crying in a 24 hour period. She then compares the mean time spent crying for boys and for girls. II. The statistician randomly selects 100 newborn baby girls and 100 newborn baby boys. She records how much time each baby spends crying in a 24 hour period. She then compares the mean time spent crying for boys and for girls. Which are the proper choices for the hypothesis tests? O The proper tests cannot be determined until we see the actual data that are collected. Scenario I calls for a 2 sample t-test, and Scenario Il calls for a matched pairs t-test. O Both scenarios require a 2 sample t-test. Both scenarios require a matched pairs t-test Scenario I calls for a matched pairs t-test, and Scenario Il calls for a 2 sample t-test.

Q: 3 -4- -0- 4. 2.

A:

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