Question: 19. In Case Study 1.1, Lee Salk did an experiment to see if hearing the sound of a human heartbeat would help infants gain weight

19. In Case Study 1.1, Lee Salk did an experiment to see if hearing the sound of a human heartbeat would help infants gain weight during the first few days of life.

By comparing weight gains for two sample groups of infants, he concluded that it did. One group listened to a heartbeat and the other did not.

a. What are the null and alternative hypotheses for this study?

b. Was this a one-sided test or a two-sided test? Explain.

c. What would a type 1 and type 2 error be for this study?

d. Given the conclusion made by Dr. Salk, explain which error he could possibly have committed and which one he could not have committed.

e. Rather than simply knowing whether there was a difference in average weight gains for the two groups, what statistical technique would have provided additional information?

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