H 0 : x = 15 days H a : x > 15 days In planning a study on the number of days in

Question

H0 : x = 15 days
Ha : x > 15 days

In planning a study on the number of days in the last 30 that high school students texted while driving sometime during the day, a researcher states the hypotheses as

H0 : x = 15 days
Ha : x > 15 days

What’s wrong with this? A. Hypotheses are statements about parameters, not statistics. The research question is not about the sample mean (x), but should be about the population mean, . B. Hypotheses are statistics, not statements about parameters. The research question is not about the population mean but should be about the sample mean x. C. All are correct.

Explanation / Answer

Hypotheses are statements about parameters, not statistics. The research question is not about the sample mean (x), but should be about the population mean, .

Therefore, correct hypothesis should be:

H0 : = 15 days
Ha : > 15 days

The correct answer is: A

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