Peter, a eacher in a college, randomly his class to complete an assigned task, the sample mean completion time is found. Using this x, Peter found that the 95% confidence interval for the true average time in completing the task is (17.278, 28.722) minutes. Peter thinks that this interval is too wide, that means the speed of students doing an in-class exercise has to be improved. Therefore, he thinks a confidence interval of total width 5 minutes will be more desirable. (Hints: width of C.I. = upper limit minus lower limit) (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 (a).

Peter, a eacher in a college, randomly his class to complete an assigned task, the sample mean completion time is found. Using this x, Peter found that the 95% confidence interval for the true average time in completing the task is (17.278, 28.722) minutes. Peter thinks that this interval is too wide, that means the speed of students doing an in-class exercise has to be improved. Therefore, he thinks a confidence interval of total width 5 minutes will be more desirable. (Hints: width of C.I. = upper limit minus lower limit) (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 (a).

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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