The heights of a simple random sample of 400 male high school sophomores in aMidwestern state are measured. The sample mean is x = 66.2 inches. Suppose that theheights of male high school sophomores follow a Normal distribution with a standarddeviation of o= 4.1 inches. Suppose the heights of a simple random sample of 100male sophomores were measured rather than 400. Which of the following statements istrue?A) The margin of error for the 95% confidence interval would increase.B) The margin of error for the 95% confidence interval would decrease.C) The margin of error for the 95% confidence interval would stay the same becausethe level of confidence has not changed.D) The standard deviation owould decrease.

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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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1. A random sample of 50 students in Holy Angel University shows that they spend an average of 3 hours per day on social media apps with a standard deviation of 0.5 hours. Assume a normal distribution. Construct a 90% and 97% confidence interval for the average number of hours spent on social media apps per day.
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