Answered: n order to compare the means of two…

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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In order to compare the means of two populations, independent random samples of 225 observations are selected from each population with the following results.

Sample 1

Sample 2

1 = 478

2 = 481

s1 = 14.2

s2 = 11.2

a) Write the null and alternative hypothesis to test if there is difference between groups

b) Calculate z- test statistic

c) Write the decision (reject or no null hypothesis).

Expert Solution

Step 1

$μ_{1} = p o p u l a t i o n m e a n f o r s a m p l e 1$

$μ_{2} = P o p u l a t i o n m e a n f o r s a m p l e 2$

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