A researcher is interested in finding a 98% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 139 students who averaged 42.4 minutes concentrating on their professor during the hour lecture. The standard deviation was 13.6 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a [✔ distribution. O b. With 98% confidence the population mean minutes of concentration is between minutes. and c. If many groups of 139 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 mean minutes of concentration and about percent will not contain the true population mean minutes of concentration

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A researcher is interested in finding a 98% confidence interval for the mean number minutes
students are concentrating on their professor during a one hour statistics lecture. The study
included 139 students who averaged 42.4 minutes concentrating on their professor during the
hour lecture. The standard deviation was 13.6 minutes. Round answers to 3 decimal places
where possible.
a. To compute the confidence interval use a t
distribution.
b. With 98% confidence the population r mean minutes of concentration is between
minutes.
and
c. If many groups of 139 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 mean minutes of concentration and about
percent will not contain the true population mean minutes of concentration.
Transcribed Image Text:A researcher is interested in finding a 98% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 139 students who averaged 42.4 minutes concentrating on their professor during the hour lecture. The standard deviation was 13.6 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a t distribution. b. With 98% confidence the population r mean minutes of concentration is between minutes. and c. If many groups of 139 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 mean minutes of concentration and about percent will not contain the true population mean minutes of concentration.
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