8. A cruise company would like to estimate the average beer consumption to plan

Question

8. A cruise company would like to estimate the average beer consumption to plan its beer inventory levels on future seven-day cruises. (The ship certainly doesn't want to run out of beer in the middle of the ocean!) The average beer consumption over 18 randomly selected seven-day cruises was 81,739 bottles with a sample standard deviation of 4,584 bottles. Complete parts a and b below. a. Construct an 80% confidence interval to estimate the average beer consumption per cruise. The 80% confidence interval to estimate the average beer consumption per cruise is from a lower limit of (Round to the nearest whole numbers.) b. What assumptions need to be made about this population? bottles to an upper limit of O A. O B. ° C. O D. The only assumption needed is that the population size is larger than 30. The only assumption needed is that the population follows the Student's t-distribution. The only assumption needed is that the population follows the normal probability distribution. The only assumption needed is that the population distribution is skewed to one side.

Explanation / Answer

here std error of mean =std deviation/(n)1/2 =4584/(18)1/2 =1080.459

for 80% CI and (n-1=17) df ; critical value of t =1.334

hence 80% confidence interval for average beer consumption =sample mean -/+ t*std error =80298 to 83180

b)option C is correct,

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