smart phone manufacturer is interested in constructing a 90% confidence interval for the proportion of smart phones that break before the warranty expires. 84 of the 1700 randomly selected smart phones broke before the warranty expired. Round answers to 4 decimal places where possible.
smart phone manufacturer is interested in constructing a 90% confidence interval for the proportion of smart phones that break before the warranty expires. 84 of the 1700 randomly selected smart phones broke before the warranty expired. Round answers to 4 decimal places where possible.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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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. 84 of the 1700 randomly selected smart phones broke before the warranty expired. Round answers to 4 decimal places where possible.
Transcribed Image Text:A smart phone manufacturer is interested in constructing a 90% confidence interval for the
proportion of smart phones that break before the warranty expires. 84 of the 1700 randomly
selected smart phones broke before the warranty expired. Round answers to 4 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 1700 randomly selected smart phones are selected, then a different
confidence interval would be produced for each group. About 90
confidence intervals will contain the true population proportion of all smart phones that break
percent of these
before the warranty expires and about 10
percent will not contain the true
population proportion.
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