Answered: A sample of n=31n=31 data values…

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 sample of n=31n=31 data values randomly collected from a normally distributed population has variance s2=27.5s2=27.5. We wish to test the null hypothesis H0:σ2=52.4H0:σ2=52.4 against the alternative hypothesis H1:σ2<52.4H1:σ2<52.4 at a significance of α=0.01α=0.01.

What is the value of the test statistic? Write your answer rounded to 3 decimal places.

What is the critical value? Write your answer rounded to 3 decimal places.

Do we reject the null hypothesis?

We fail to reject the null hypothesis.
We reject the null hypothesis.

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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