According to the report the mean monthly cell phone bill was

According to the report, the mean monthly cell phone bill was $48.95 three years ago. A researcher suspects that the mean monthly cell phone bill 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 mean monthly cell phone bill is different from $48.95, when in fact the mean bill is $48.95. B. The sample evidence did not lead the researcher to believe the mean monthly cell phone bill is different from $48.95, when in fact the mean bill is different from $48.95. C. The sample evidence led the researcher to believe the mean monthly cell phone bill is higher than $48.95, when in fact the mean bill is $48.95. (c) Explain what it would mean to make a Type II error. Choose the correct answer below. A. The sample evidence did not lead the researcher to believe the mean monthly cell phone bill is different from $48.95, when in fact the mean bill is different from $48.95. B, The sample evidence led the researcher to believe the mean monthly cell phone bill is different from $48.95, when in fact the mean bill is different from $48.95. C. The sample evidence did not lead the researcher to believe the mean monthly cell phone bill is higher than $48.95, when in fact the mean bill is higher than $48.95.

Solution

(a)B

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(b) Type I error: We reject Ho when it is true.

A

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(c) Type II error: We do not reject Ho when it is false.

A