According to the report, the mean monthly cell phone bill was $49.64 three years ago. A researcher suspects that the mean monthly cell phone bill is different today.

(a) Determine the null and alternative hypotheses.
(b) Explain what it would mean to make a Type I error.
(c) Explain what it would mean to make a Type II error.

See attachment.

Question

According to the report, the mean monthly cell phone bill was $49.64 three years ago. A researcher suspects that the mean monthly cell phone bill is different today.

(a) Determine the null and alternative hypotheses.
(b) Explain what it would mean to make a Type I error.
(c) Explain what it would mean to make a Type II error.

See attachment.

anonymous · Answer

attachment

anonymous · Answer

@phi  that link just confuses me more!

phi · Answer

(a) Determine the null and alternative hypotheses.

Ho:  mean monthly cell phone was 49.64 3 years ago
H1:  mean monthly cell phone was not 49.64 , 3 years ago

(b) Explain what it would mean to make a Type I error.
Rejecting the Null Hypothesis even though it is true.  In this case,  a type I error is saying the mean monthly cell pone bill is not 49.64, even though it really is.


(c) Explain what it would mean to make a Type II error.
That would be to accept the null hypothesis, even though it is false.  In this case, to say the mean of the monthly cell phone bill is 49.64, even though it is not.