Answered: A campus newspaper reported that the…

Name: A campus newspaper reported that the average cell phone bill of colleg
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Description: A campus newspaper reported that the average cell phone bill of college students is $140 or more per month. We believe this figure is an exaggeration and the average monthly bill is less. We took a random sample of 35 students and found the average o

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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A campus newspaper reported that the average cell phone bill of college students is $140 or more per month. We believe this figure is an exaggeration and the average monthly bill is less. We took a random sample of 35 students and found the average of their last month bill was $136. Assume monthly bills are normally distributed with a standard deviation of $15.

Do a hypothesis test using the p-value method with 8% significance level. Show the null and alternative hypotheses, calculate the test statistic and p-value, make a conclusion and interpret it.

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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