Question

A smart phone manufacturer is interested in constructing a 95% confidence interval for the proportion of smart phones that break before the warranty expires. 88 of the 1543 randomly selected smart phones broke before the warranty expired. Round answers to 4 decimal places where possible. If many groups of 1543 randomly selected smart phones are selected, then a different confidence interval would be produced for each group. About what percent of these confidence intervals will contain the true population proportion of all smart phones that break before the warranty expires and about what percent will not contain the true population proportion?

Answer 1