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 103 students who averaged 32.7 minutes concentrating on their professor during the hour lecture. The standard deviation was 11.4 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? t z distribution. b. With 98% confidence the population mean minutes of concentration is between _____and _____ minutes. c. If many groups of 103 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.
A researcher is interested in finding a 98% confidence interval for the
a. To compute the confidence interval use a ? t z distribution.
b. With 98% confidence the population mean minutes of concentration is between _____and _____ minutes.
c. If many groups of 103 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.
Step by step
Solved in 4 steps