2. the human relations department of electronics, inc. would like to include a dental plan as part of the company’s benefit package. first the company would need to know how much a typical employee and family spent per year on dental expenses. a random sample of 400 employees revealed the average amount spent was $1,700 with a population standard deviation of $500. a. what is the point estimate and the standard error of the mean for dental expenses? explain. b. find the 92% confidence interval estimate. c. what sample size would be appropriate, if the department wanted to be 99% confident with an error of no more than $50.00.