For each of the following studies, define the parameter of interest and state ap

Question

For each of the following studies, define the parameter of interest and state appropriate null and alternative hypotheses to test. Common wisdom states that you should be getting 8 hours of sleep. You test to see if, on average, you are not getting enough sleep. A farmer has been using the same fertilizer for decades. Last season, his mean corn yield was 72 kg per acre. His son wants to test a newly developed fertilizer on one of the fields to show that it will improve the mean yield. A weight loss program promises that participants will lose at least 10 pounds in two weeks. A fraud prevention firm tests this claim by asking 12 random participants their weight at the beginning of the program and weight after two weeks.

Explanation / Answer

(a) Parameter: Mean number of hours of sleep

Ho: = 8 versus Ha: < 8

(b) Parameter: Mean yield from the farm

Ho: 72 versus Ha: > 72

(c) Parameter: Mean weight loss

Ho: 10 versus Ha: > 10

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