You are interested in finding a 98% confidence interval for the average number of days of class that college students miss each year. The data below show the number of missed days for 14 randomly selected college students.   1 5 5 2 11 9 3 6 12 0 12 1 12 1   a. To compute the confidence interval use a ? t z Correct distribution.     b. With 98% confidence the population meannumber of days of class that college students miss is between  and   days. c. If many groups of 14 randomly selected non-residential college students are surveyed, then a different confidence interval would be produced from each group. About Correct percent of these confidence intervals will contain the true population mean number of missed class days and about Correct percent will not contain the true population mean number of missed class days.

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.