According to the report, the standard deviation of monthly cell phone bills was

Question

According to the report, the standard deviation of monthly cell phone bills was $49.44 three years ago. A researcher suspects that the standard deviation of monthly cell phone bills is different today. (a) Determine the null and alternative hypotheses. Choose the correct answer below. (b) Explain what it would mean to make a Type I error. Choose the correct answer below. A. The sample evidence led the researcher to believe the standard deviation of monthly cell phone bills is different from $49.44, when in fact the standard deviation of bills is $49.44. B. The sample evidence did not lead the researcher to believe the standard deviation of monthly cell phone bills is different from $49.44, when in fact the standard deviation of bills is different from $49.44. C. The sample evidence led the researcher to believe the standard deviation of monthly cell phone bills is higher than $49.44, when in fact the standard deviation of bills is $49.44. (c) Explain what it would mean to make a Type II error. Choose the correct answer below. A. The sample evidence led the researcher to believe the standard deviation of monthly cell phone bill is different from $49.44, when in fact the standard deviation of bills is different from $49.44. B. The sample evidence did not lead the researcher to believe the standard deviation of monthly cell phone bills is higher than $49.44, when in fact the standard deviation of bills is higher than $49.44. C. The sample evidence did not lead the researcher to believe the standard deviation of monthly cell phone bills is different from $49.44, when in fact the standard deviation of bills is different from $49.44.

Explanation / Answer

Answers:

(a) Option (C)

(b) Option (A)

(c) Option (C)

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