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Calculate confidence intervals

In a study using 15 samples, and in which the population variance is unknown, the distribution that should be used to calculate confidence intervals is

A. a standard normal distribution.

B. a t distribution with 14 degrees of freedom.

C. a t distribution with 15 degrees of freedom.

D. a t distribution with 16 degrees of freedom.

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## Q : Percent of all applicants

What percent of all applicants had scores higher than 13? What percent of those who entered medical school had scores between 8 and 12?