The common causes of variation are the ________.
A) variations in the measurement systems of a process alone
B) variations resulted from many small differences in the factors of a process, taken together
C) variations that can be explained
D) variations caused by any one of the factors of a process
Question 2
The management of a department store is interested to estimate the difference in the amount of money spent by female and male shoppers. You are given the following information.
Female Shoppers Male ShoppersSample size 64 49Sample mean 140 125Population standard deviation 10 8A 95 percent confidence interval estimate for the difference between the average purchases of the customers using the two different credit cards is:A) 49 to 64
B) 11.68 to 18.32
C) 125 to 140
D) 8 to 10
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