Answered: The mean number of hours for persons…

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 number of hours for persons watching a tv show was 2.98 hours each day with a standard deviation of 2.66. Assume that in a sample of 40 teenagers the sample standard deviation of daily tv time is 1.9 hours, and that the population of tv watching times is normally distributed. Explain why the population standard deviation of tv watching time for teenagers is less than 2.66 .

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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