Question

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A marketing research company desires to know the mean consumption of milk per week among males over age 22. A sample of 100 males over age 22 was drawn and the mean milk consumption was 3.6 liters. Assume that the population standard deviation is known to be 0.7 liters. Construct the 80% confidence interval for the mean consumption of milk among males over age 22. Round your answers to one decimal place.

PLEASE DOUBLE CHECK ANSWERS ARE CORRECT

Answer 1

We have given that,              
              
Sample mean =3.6      
Population standard deviation=0.7  
Sample size=100      
Level of significance =1-0.80=0.2      
Z critical value (by using Z table)=1.282      
              


Lower confidence limit =3.5
Upper confidence limit =3.7