In the past, a business noted its mean sales order size was $100. This business is interested intesting whether a recent advertising campaign has increased its mean sales order size. A randomsample of 40 orders produced a sample mean of $105. Assume the standard deviation is knownto be $15 and sales order size is normally distributed. What is the test statistic?1.492.582.362.11O 1.05ORMẢW30P

Sample size n =40Sample mean=105Standard deviation =15

Answered: past, a business noted its mean sales…

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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Statistics students believe that the mean score on a first statistics test is 65. The instructor thinks that the mean score is higher. She samples 10 statistics students and obtains the scores: Grades 73.5 63.9 64.3 85.5 62.7 69 88 63.9 65 64.3 Test grades are believed to be normally distributed.Use a significance level of 5%.
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