A smart phone manufacturer is interested in constructing a 90% confidence interval for the proportion of smart phones that break before the warranty expires. 91 of the 1608 randomly selected smart phones broke before the warranty expired. Round answers to 5 decimal places where possible. a.  With 90% confidence the proportion of all smart phones that break before the warranty expires is between  ?  and .? b.  If many groups of 1608 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.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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A smart phone manufacturer is interested in constructing a 90% confidence interval for the proportion of smart phones that break before the warranty expires. 91 of the 1608 randomly selected smart phones broke before the warranty expired. Round answers to 5 decimal places where possible.

a.  With 90% confidence the proportion of all smart phones that break before the warranty expires is between  ?  and .?

b.  If many groups of 1608 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. 

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