Question

# In a survey of a simple random sample of 1,500 customers who did holiday shopping online...

In a survey of a simple random sample of 1,500 customers who did holiday shopping online during last year’s holiday season, 270 indicated that they were not satisfied with their shopping experience. Of the customers who were not satisfied, 143 reported that they did not receive their purchases in time for the holidays, while 1,197 of the customers who were satisfied with their experience indicated that they did receive their purchases in time for the holidays. What is the width of the 90% large sample confidence interval for the difference in satisfaction rates for customers who received their purchases on time compared to those who did not?

A. less than 10% B. at least 10%, but less than 20% C. at least 20%, but less than 30% D. at least 30% E. Not enough information to determine.

ERRATA: Formula for SE is WRONGLY WRITTEN ABOVE.

CORRECTED FORMULA :

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