Suppose we want a 90 confidence interval for the average

Reference no: EM13616645

Suppose we want a 90% confidence interval for the average amount of time (in minutes) spent per week on homework by the students in a large introductory statistics course at a large university. The interval is to have a margin of error of 2 minutes, and the amount spent has a Normal distribution with a standard deviation ? = 30 minutes. The number of observations required is closest to

A. 25.

B. 30.

C. 609

D. 865.

Reference no: EM13616645

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