Question

A smart phone manufacturer is interested in constructing a 99% confidence interval for the proportion of smart phones that break before the warranty expires. 86 of the 1560 randomly selected smart phones broke before the warranty expired. Round answers to 4 decimal places where possible.

a. With 99% confidence the proportion of all smart phones that break before the warranty expires is between ____ and______ .

b. If many groups of 1560 randomly selected smart phones are selected, then a different confidence interval would be produced for each group. About _______ percent of these confidence intervals will contain the true population proportion of all smart phones that break before the warranty expires and about _______ percent will not contain the true population proportion.  

Question 2.

Answer 1