Question: A researcher is interested in finding a 98% confidence interval for the mean number of times per day that college students text. The study included

A researcher is interested in finding a 98% confidence interval for the mean number of times per day that college students text. The study included 131 students who averaged 37.2 texts per day. The standard deviation was 12.5 texts. Round answers to 3 decimal places where possible.

a. To compute the confidence interval use a ?

t z distribution.

b. With98% confidence the population mean number of texts per day is between_______ and _______ texts.

c.If many groups of 131 randomly selected members are studied, then a different confidence interval would be produced from each group. About____ percent of these confidence intervals will contain the true population number of texts per day and about_____ percent will not contain the true population mean number of texts per day.

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