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 149 students who averaged 39.2 texts per day. The standard deviation was 24.2 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? t or z distribution. b. With 90% confidence the population mean number of texts per day is between___ and ____ texts. c. If many groups of 149 randomly selected members are studied, then a different confidence interval would be produced from each group. About 90% 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 149 students who averaged 39.2 texts per day. The standard deviation was 24.2 texts. Round answers to 3 decimal places where possible.
a. To compute the confidence interval use a ? t or z distribution.
b. With 90% confidence the population mean number of texts per day is between___ and ____ texts.
c. If many groups of 149 randomly selected members are studied, then a different confidence interval would be produced from each group. About 90% 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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