A car manufacture produces a new car that advertises an average of 30 MPG. Thedistribution of MPG of cars is normally distributed. The manufacturer will test 30 cars off theassembly line to find a confidence interval of the average MPG of their new vehicle todetermine if it is close to 30. The average MPG of the 30 cars is 31.2 gallons with a standarddeviation of 2 gallons. Find a 95% confidence interval for the average MPG of the newvehicle.(30.45, 31.95)(30.48, 31.92)O (31.18, 31.22)O The sample size is too small to compute a confidence interval.

The confidence is the combined value of sample statistic and the margin of error. Margin error is…

Answered: A car manufacture produces a new car…

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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identify the t-score for a 90% confidence interval if the sample size is 31. t=
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A statistics teacher taught a large introductory statistics class, with 500 students having enrolled over many years. The mean score over all those students on the first midterm was u = 88 with standard deviation o = 10. One year, the teacher taught a %3D much smaller class of only 25 students. The teacher wanted to know if teaching a smaller class was more effective and students performed better. We can consider the small class as an SRS of the students who took the large class over the years. The average midterm score was = 78. The hypothesis should be: a. Ho: H = 78 vs. Ha: H = 88. %3D O b. Ho: µ = 88 vs. Ha: µ 78 %3D Ο d. Ho: μ-88 νs. Ha: μ >88. %3D
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