The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 78.8 for a sample of size 589 and standard deviation 17.9. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 98% confidence level). Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).  < μμ <

A fitness center is interested in finding a 98% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 252 members were looked at and their mean number of visits per week was 2.5 and the standard deviation was 1.9. a. To compute the confidence interval use a ? distribution. b. With 98% confidence the population mean number of visits per week is between and visits. c. If many groups of 252 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 number of visits per week and about percent will not contain the true population mean number of visits per week.

in a test of a lifelong brand of tires , a survey revealed that the mean life was 35,000 mikes and the standard deviation was 7083 mikes.  if the shape of the population distribution is known to be normal, approximately what percentage of the tires lasts less than 20834 miles ?

The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 41.9 for a sample of size 304 and standard deviation 16.7.Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 99% confidence level).Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). < μμ <