A researcher is interested in finding a 90% confidence interval for the mean number of times per day that college students text. The study included 142 students who averaged 34.5 texts per day. The standard deviation was 18.8 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? t z distribution. b. With 90% confidence the population mean number of texts per day is between ______ and _____ texts. c. If many groups of 142 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.
A researcher is interested in finding a 90% confidence interval for the mean number of times per day that college students text. The study included 142 students who averaged 34.5 texts per day. The standard deviation was 18.8 texts. Round answers to 3 decimal places where possible.
a. To compute the confidence interval use a ? t z distribution.
b. With 90% confidence the population mean number of texts per day is between ______ and _____ texts.
c. If many groups of 142 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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