A random sample of 40 college students has a mean earnings of​ $3120 over the summer months. Assume the population standard deviation of earnings over the summer months for college students is​ $677 and that the distribution of earnings over the summer months for college students is normally distributed. Determine whether a normal distribution or a​ t-distribution should be used or whether neither of these can be used to construct a confidence interval.

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Part 1

A.

Cannot use a normal distribution or a​ t-distribution.

B.

Use a normal distribution.

C.

Use a​ t-distribution.