Question

PLEASE DOUBLE CHECK ANSWER, AND NO HANDWRITTEN ANSWERS. THANK YOU!!

A fast food restaurant executive wishes to know how many fast food meals adults eat each week. They want to construct a 99% confidence interval with an error of no more than 0.06. A consultant has informed them that a previous study found the mean to be 7.5 fast food meals per week and found the standard deviation to be 1.4. What is the minimum sample size required to create the specified confidence interval? Round your answer up to the next integer.

Answer 1

We have given here,              
              
Population standard deviation =   1.4
Margin of error =E=0.06
Level of significance =1-0.99=0.01
Z critical value is (by using Z table)=2.58

Sample size formula is

=3610.007

              
Therefore, sample size approximately will be 3611