Cassie Moran 11/19/17 11:06 PM Math 240-07 Statistical Methods I Fall 2017 Homew

Question

Cassie Moran 11/19/17 11:06 PM Math 240-07 Statistical Methods I Fall 2017 Homework: Section 6.2 Confidence Intervals (Pop. SD Unknown) 501109 complete) MN Score: 67.5%, 6.75 of 10 pts Score: 0 of 1 pt Question Heip 6.2.17-T n a random sample of 29 people, the mean commute time to work was 30.7 minutes and the standard deviation was 7.2 minutes. Assume the population is nomally and use a ldsntion toconstr ct a98% cortoence mmal bfthe populaton mean . what is te mrgn of error of ? Inerpret the rests (Round to one decimal place as needed) Enter your answer in the edit fields and then click Chack Arswer Clear All Check Answer OK Search or enter website name @, 2 3 6 0

Explanation / Answer

Standard error of the mean = SEM = S/N = 1.337

t(, N-1) = 2.467

Confidence interval = m +/- (t(, N-1)*SEM)

Mean = 30.7

Lower bound: 27.4

Upper bound: 34.0

Thus, 98% Confidence interval is (27.4, 34.0)

-------------

Find margin of error as

=34.0 - 30.7

=3.3

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