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  3. (a) a study of 4-year college graduates showed

(a) A study of 4-year college graduates showed that the average graduate had 132 credit hours. The...

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Statistics

(a)

A study of 4-year college graduates showed that the averagegraduate had 132 credit hours. The following 6 samples of credithours were recorded from Maryland college's students concerningtheir credit hours upon graduation:

                                      137,135, 151, 122, 131, 141

i.

Calculate the sample mean and sample standard deviation.

ii.

Construct a 95% confidence interval for the population meannumber of credit hours for 4-year graduates                                                                                                        

iii.

Is there significant evidence to suggest that the average numberof credit hours for 4-year graduates is different from 132 credithours? Test at the 1% significance level.

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