| I need help with these statistic questions for my test?
9. The mean score for all Nbam games during a particular season was less than 100 points per game. Identify the type I and type II errors for the hypothesis test of this claim.
10) In a random sample of 60 computers, the mean repair cost was $150 with a standard deviation of $36.
a) Construct the 99% confidence interval for the population mean repair cost.
b) If the level of confidence was lowered to 95% what will be the effect on the confidence interval?
11. In a recent study of 84 eighth graders, the mean number of hours per week that they watched television was 22.3 with a standard deviation of 5.8 hours.
a)find the 90% confidence interval of the mean,
b) If the standard deviation is doubled to 11.6, what will be the efftec on the confidence interval? | 
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