Answered: The mean score on the math portion of…

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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The mean score on the math portion of the ACT for the year 2000 is μ = 20.7. A sample of 20 students in a local school district had a mean of 22.95. Using the sample, a 95% confidence interval estimate for the mean is (20.76, 25.14).

State the point estimate for the mean ACT score for students.

Based on this sample information , do you believe that the local students have a mean different from the general population? Why?

		22.95 is in the center of the interval. The means are definitely not different.
		22.95 is just outside the 95% confidence interval. Can't say the means are really different.
		22.95 is not equal to 20.7. The means are definitely different.
		20.7 is just outside the 95% confidence interval. Can't say the means are really different.

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