business data

Q2: |The Human Resources Dept. of Cigna would like to include a dental plan as part of the benefits package. The question is: How much money does a typical employee and his/her family spend per year on dental expenses? A sample of employee dental expenses is included in the attached data set. The population standard deviation is known and determined to be $660.00 from historical records. Assume a confidence level of 95%. Standard known What is the population mean? Known $1761.31 What is the point estimate of the population meal? What statistical distribution (Standard Normal, or Student's t) should be used in this scenario? What is the value of z or t ? What is the standard error of the mean? What is the margin of error? What is the interval estimate for the population mean (provide upper and lower confidence limits)