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Name: A national firm reports mean earnings of $75 ± $12 (µ ± σ) per unit so
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Description: A national firm reports mean earnings of $75 ± $12 (µ ± σ) per unit sold over the lifetime of the company. A competing company over the past 36 reporting periods had reported mean earnings equal to $78 per unit sold. Conduct a one-sample z test to de

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 national firm reports mean earnings of $75 ± $12 (µ ± σ) per unit sold over the lifetime of the company. A competing company over the past 36 reporting periods had reported mean earnings equal to $78 per unit sold. Conduct a one-sample z test to determine whether mean earnings (in dollars per unit) are larger (compared to that reported by the national firm) at a .05 level of significance.

State the value of the test statistic and whether to retain or reject the null hypothesis.

Compute effect size using Cohen’s d.

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