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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 : Population of a country

The weights of newborn baby boys in the population of a country follow a normal distribution with a mean of 105.3 ounces, and a standard deviation of 10.2 ounces. (Replace the "X" with the last digit of your student ID number)