The market researcher in a certain company conducted a study to assess the effectiveness of a new computerized system of filling orders. He selected a random sample of 100 customers served using the old system and 100 served using the new system. He contacts each customer to find out whether or not the order was filled satisfactorily within 2 weeks. Results were recorded in the accompanying table:SystemSatisfiedNot SatisfiedTotalOLD6832100NEW8515100Total15347200 Test at alpha equal to 5% the null hypothesis that the proportion of satisfied customers among those served by the new system is the same as that among those served by the old system.

Answered: The market researcher in a certain…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.6: Summarizing Categorical Data

Problem 25PPS

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The market researcher in a certain company conducted a study to assess the effectiveness of a new computerized system of filling orders. He selected a random sample of 100 customers served using the old system and 100 served using the new system. He contacts each customer to find out whether or not the order was filled satisfactorily within 2 weeks. Results were recorded in the accompanying table:

System	Satisfied	Not Satisfied	Total
OLD	68	32	100
NEW	85	15	100
Total	153	47	200

Test at alpha equal to 5% the null hypothesis that the proportion of satisfied customers among those served by the new system is the same as that among those served by the old system.

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