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 122 students who averaged 25.2 texts per day. The standard deviation was 14.7 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a V distribution.

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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 122 students who averaged 25.2 texts per day. The
standard deviation was 14.7 texts. Round answers to 3 decimal
places where possible.
a. To compute the confidence interval use a
distribution.
b. With 90% confidence the population mean number of texts per
day is between
and
texts.
c. If many groups of 122 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.
Transcribed Image Text: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 122 students who averaged 25.2 texts per day. The standard deviation was 14.7 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a distribution. b. With 90% confidence the population mean number of texts per day is between and texts. c. If many groups of 122 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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