A wholesaler has recently developed a computerized sales invoicing system. Prior to implementing this system, a manual system was used. The distribution of the number of errors per invoice for the manual system is as follows: Errors per Invoice 1 2 3 More Than 3 Percentage of Invoices 84% 7% 4% 3% 2% After implementation of the computerized system, a random sample of 500 invoices gives the following error distribution: Errors per Invoice Number of Invoices More Than 3 480 7 8 2 3 pi Ei fi (f - E) ^ 2/E 8.5714 22.4000 7.2000 11.2667 0.84 420 480 0.07 35 7 0.04 20 8 0.03 15 2. 0.02 10 3 4.9000 Chi-Square 54.33810 p-value 0.0000001096 (a) Show that it is appropriate to carry out a chi-square test using these data. Each expected value is 2

A wholesaler has recently developed a computerized sales invoicing system. Prior to implementing this system, a manual system was used. The distribution of the number of errors per invoice for the manual system is as follows: Errors per Invoice 1 2 3 More Than 3 Percentage of Invoices 84% 7% 4% 3% 2% After implementation of the computerized system, a random sample of 500 invoices gives the following error distribution: Errors per Invoice Number of Invoices More Than 3 480 7 8 2 3 pi Ei fi (f - E) ^ 2/E 8.5714 22.4000 7.2000 11.2667 0.84 420 480 0.07 35 7 0.04 20 8 0.03 15 2. 0.02 10 3 4.9000 Chi-Square 54.33810 p-value 0.0000001096 (a) Show that it is appropriate to carry out a chi-square test using these data. Each expected value is 2

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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Errors in medical prescriptions occur relatively frequently. In a study, two groups of doctors had similar err rates and one group switched to e-prescriptions while the other continued with hand-written prescriptions. C year later, the number of errors was measured. The results are given in the two-way table. No Error Error 254 Electronic 3594 Written 1478 2370 a). Fill in the row and column totals. b). What proportion of all the prescriptions had errors in them? c). What proportion of electronic prescriptions had errors in them? d). What proportion of written prescriptions had errors in them? e). What proportion of the prescriptions with errors were written prescriptions?
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a. Set up a contingency table on education (X) and job satisfaction (Y). If needed, round yourpercentages to one decimal place (e.g., 10.4%) .b. Analyze the table to explain if there is a relationship between education and job satisfaction. Inyour answers, be sure to compare the percentages in each row
Table 1: Birds counted at a New Jersey Wildlife Conservation Park Bird Species Ruby Throated Hummingbird House Sparrow Purple Martin Count Spring Summer Winter 21 32 0 21 19 14 3 25 21
1.The Prevalence of having health insurance (as a decimal) for 1 (Table 4 box b. above) is: 2. The Prevalence of having health insurance (as a decimal) for 2 (Table 4 box e. above) is: 3.The Prevalence of having health insurance (as a percentage) for 1 (Table 4 box c. above) is: 4.The Prevalence of having health insurance (as a Percentage) for 2 (Table 4 box f. above) is:
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