A fitness center is interested in finding a 98 confidence interval for the standard deviation of the number of days per week that their members come in Records of 28 members were looked at and the standard deviation was 2 9 Use 2 decimal places in your answer a To compute the confidence interval use a Select an answer distribution b With 98 confidence the population standard deviation number of visits per week is between visits and c If many groups of 28 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 standard deviation number of visits per week and about percent will not