A sample of 40 speedometers for 'Pragya is obtained in tamale and each is calibrated to check for accuracy at 55km. the resulting sample average and sample standard deviation 53.8and 13 respectively. does the sample information suggest that the true mean for the speedometer is not accurate at 55km

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 7PPS
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A sample of 40 speedometers for 'Pragya is obtained in tamale and each is calibrated to check for accuracy at 55km. the resulting sample average and sample standard deviation 53.8and 13 respectively. does the sample information suggest that the true mean for the speedometer is not accurate at 55km? use an alpha level of 0.01

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