7. Last year the employees of the city sanitation department donated an average of $10.00 to the volunteer rescue squad. Test the hypothesis at the 0.01 level of significance that the average...

7. Last year the employees of the city sanitation department donated an average of $10.00

to the volunteer rescue squad. Test the hypothesis at the 0.01 level of significance that the

average contribution this year is still $10.00 if a random sample of 12 employees showed

an average donation of $10.90 with a standard deviation of $ 1.75. Assume that the donations are approximately normally distributed.