6.A)Calculate the 95% confidence interval for the mean using the given population standard deviation. Assume that the data come from a normally distributed population.

Twenty individual Weddell seals from Antarctica were weighed, giving the following data (in pounds).

906 920924932937

941 945948949951

957958961965969

970 975982987991

Suppose the population standard deviation is22.1lb. (Round your answers to one decimal place.)

_______ to ______ (in days)

B)Calculate the 95% confidence interval for the mean using the given population standard deviation. Assume that the data come from a normally distributed population.

Multiple sclerosis is a serious neurological disease. The following data set gives the age of onset of multiple sclerosis for32 individuals. 2352322728301344

332925312630529

4127303428193135

3228332831292937

Suppose the population standard deviation is8.1years. (Round your answers to one decimal place.)

__________ to ___________ (days)

C)Calculate the 95% confidence interval for the mean using the given population standard deviation. Assume that the data come from a normally distributed population.

The duration of stay for 20 patients at a major US hospital is given in the following data set.

6 105125

4 4112615

22 43713

23 18292317

Suppose the population standard deviation is9.7days. (Round your answers to one decimal place.)

________ to _______ (days)