A researcher is interested in finding a 95 confidence interval for the mean number of...
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A researcher is interested in finding a 95 confidence interval for the mean number of times per day that college students text The study included 81 students who averaged 25 9 texts per day The standard deviation was 13 6 texts Round answers to 3 decimal places where possible a To compute the confidence interval which distribution should you use t distribution z distribution b With 95 confidence the population mean number of texts per day is between 22 941 and 28 589 texts c If many groups of 81 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
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