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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 : Confidence interval for the true mean fat percentage

Fat contents (in percentage) for 10 randomly selected hot dogs were given in the article "Sensory and Mechanical Assessment of the Quality of Frankfurters". Use the following data to construct a 90% confidence interval for the true mean fat percen