H0 x 15 days Ha x 15 days In planning a study on the num

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.

Solution

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

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

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