Question

Studies have shown that the amount of time that Canadian adults spend streaming movies is normally distributed with a mean of 12.2 hours per week, and a standard deviation of 4.2 hours per week. A. What percent of Canadians stream movies for more than 18 hours per week? B. If 10 Canadian adults were randomly selected, what is the probability that their average streaming times exceeds 16.5 hours? C. A random sample of 60 students revealed that the sample mean of the number of hours weekly they streamed movies was 18.0 with a sample standard deviation of 4.6. Test the hypothesis at a 5% level of significance that the mean number of hours students is different from the national average (12.2 hours per week).

          Studies have shown that the amount of time that Canadian adults
spend streaming movies is normally distributed with a mean of 12.2
hours per week, and a standard deviation of 4.2 hours per week.
A.  What percent of Canadians stream
movies for more than 18 hours per week?
B. If 10 Canadian adults were randomly
selected, what is the probability that their average streaming
times exceeds 16.5 hours?
C.  A random sample of 60 students
revealed that the sample mean of the number of hours weekly they
streamed movies was 18.0 with a sample standard deviation of 4.6.
Test the hypothesis at a 5% level of significance that the mean
number of hours  students is different from the national
average (12.2 hours per week).

Added by Diane O.

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