(Answered) A school claims that the average english regents score of

Statistics

A school claims that the average English regents' score of its students is at most 80. You sample 16 students and find that the sample mean is 75 and the sample standard deviation is 9

(a) Test the claim at the 0.1 significance level

(b) No claim was made by the school. They took a sample with the above results and want to construct a two-sided 95% confidence interval for the population mean. The upper limit of the confidence interval is:

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