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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 1GP

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Question

A college lecturer randomly selected thirty-five
students in his class to complete an assigned task and it
is found that the 95% confidence interval for the true
average time in completing the task is (17.278, 28.722)
minutes. It is thought that this interval is too wide, and
a confidence interval of total width 5 minutes will be
more desirable.
(a) Using the same value of x, find the new
confidence interval in this case.
(b) Find the confidence level for the interval in part

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