Answered: A competency test is modified so that…

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 competency test is modified so that the proportion of test-takers that pass is more than 75%. A simple random sample of test-takers is collected to determine if the proportion of passers is greater than 75%. The results of the sample are shown below.

Compentency Test Sample

Passed 80

Observations 100

Confidence Level .9

Critical Value 1.28

Test statistic (z) 1.15

p-value .124

number passed =

Sample proportion p^=

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