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The average height of young adult males has a normal distribution with standard deviation of 2.5 inches. You want to estimate the mean height of students at your college or university to within one inch with 93% confidence. How many male students must you measure?
21
Intro Stats / AP Statistics
Chapter 8
Confidence Intervals
Section 3
A Population Proportion
Lauren C.
October 17, 2021
How to find solution?
Missouri State University
University of North Carolina at Chapel Hill
Oregon State University
Boston College
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So one of three wants you to come up with the sample size to be 93% confidence and within one inch. So we want to be within one inch 93%. Confidence gives us a critical value of 1.812 times the standard deviation over the square root of that. So if you square everything multiple, I'm beside my end. Divide by one, you will end up with and equals one point 812 square times 2.5 squared over one. Swear this gives you 20.52 You always around these up, so you would need 21 males.
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