# A random sample of stock prices per share (in dollars) is shown

A random sample of stock prices per share (in dollars) is shown. Find
the 90% confidence interval for the mean stock price. Assume the population of stock prices is normally distributed.
26.60, 75.37, 3.81, 28.37, 40.25, 13.88, 53.80, 28.25, 10.87, 12.25
It is known that the number of hours a student sleeps per night has a normal distribution. The sleeping time in hours of a random sample of 8 students is given below. See Attached Excel for Data.
Compute a 92% confidence interval for the true mean time a student sleeps per night and fill in the blanks appropriately. We have 92 % confidence that the true mean time a student sleeps per night is between and hours. (round to 3 decimal places)
8.6, 8.3, 7.6, 6, 7.1, 5.6, 5.1, 6
The personnel department of a large corporation wants to estimate the family dental expenses of its employees to determine the feasibility of providing a dental insurance plan. A random sample of 12 employees reveals the following family dental expenses (in dollars).
115, 177, 182, 225, 228, 250, 275, 318, 370, 425, 540, 593
Construct a 93% confidence interval estimate for the mean of family dental expenses for all employees of this corporation.
Place your LOWER limit, in dollars rounded to 1 decimal place, in the first blank. Do not use a dollar sign, a comma, or any other stray mark. For example, 98.4 would be a legitimate entry. ____________
Place your UPPER limit, in dollars rounded to 1 decimal place, in the second blank. Do not use a dollar sign, a comma, or any other stray mark. For example, 567.8 would be a legitimate entry.______________

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