A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence interval for the
A) 0.148

Question

A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence interval for the
A) 0.148 < p < 0.192
B) 0.136 < p < 0.204
C) 0.144 < p < 0.196
D) 0.139 < p < 0.201

Quizplus · Accepted Answer

The 98% confidence interval is calculated using the formula for a proportion: p ± Z * sqrt(p(1-p)/n), where p = 0.17, n = 800, and Z for 98% confidence is approximately 2.33. This calculation results in the interval 0.139 < p < 0.201.

A Survey of 800 Women Shoppers Found That 17% of Them