Mathematics, 18.05.2021 19:20 lilly9645
A used car dealership surveyed 50 customers who bought a card from them two years ago. 78% of customers said that they would recommend this dealership to their friends. What is the 90% confidence interval for the percent of all former buyers who would recommend this dealership to their friends
Answers: 3
, and a confidence level of 
, we have the following confidence interval of proportions.
.
.
, z is the value of Z that has a p-value of 
, so 
. 
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