A cruise company would like to estimate the average beer consumption to plan its beer inventory levels on futureseven-day cruises.(The ship certainlydoesn't want to run out of beer in the middle of theocean!) The average beer consumption over 12 randomly selectedseven-day cruises was 81,551 bottles with a sample standard deviation of 4,556 bottles. Complete parts a and b below.

a. Construct a 90% confidence interval to estimate the average beer consumption per cruise.

The 90% confidence interval to estimate the average beer consumption per cruise is from a lower limit of

nothing

bottles to an upper limit of

nothing

bottles.

(Round to the nearest wholenumbers.)b. What assumptions need to be made about thispopulation?

A.

The only assumption needed is that the population size is larger than 30.

B.

The only assumption needed is that the population follows the normal probability distribution.

This is the correct answer.

C.

The only assumption needed is that the population follows theStudent's t-distribution.

Your answer is not correct.

D.

The only assumption needed is that the population distribution is skewed to one side.