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Description: Watching TV: The2012general Social Survey asked a large number of people how much time they spent watching TV each day. The mean number of hours was3.09with a standard deviation of2.7. Assume that in a sample of32teenagers, the sample standard deviat

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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Watching TV: The

2012

general Social Survey asked a large number of people how much time they spent watching TV each day. The mean number of hours was

3.09

with a standard deviation of

2.7

. Assume that in a sample of

teenagers, the sample standard deviation of daily TV time is

4.3

hours, and that the population of TV watching times is normally distributed. Can you conclude that the population standard deviation of TV watching times for teenagers differs from

2.7

? Use the

=α0.10

level of significance.

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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