You want to compute a 90% confidence interval for the mean of a population with unknown population

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You want to compute a 90% confidence interval for the mean of a population with unknown population standard deviation. The sample size is 30. The value of t* you would use for this interval is

(a) 1.645.

(b) 1.699.

(c) 1.697.

(d) 1.96.

(e) 2.045.

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