A wholesaler has recently developed a computerized sales invoicing system. Prior
ID: 3310274 • Letter: A
Question
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:
After implementation of the computerized system, a random sample of 500 invoices gives the following error distribution:
(a) Show that it is appropriate to carry out a chi-square test using these data.
Each Ei
(b) Use the Excel output shown above to determine whether the error percentages for the computerized system differ from those for the manual system at the .05 level of significance. What do you conclude?
(Click to select)Do not rejectReject H0: Conclude systems (Click to select)differnot differ.
Errors per Invoice 0 1 2 3 More Than 3 Percentage of Invoices 82% 9% 4% 4% 1%Explanation / Answer
a)
Each Ei 5
b) from abvoe output: as p vlaue is ;less then given .05 level of significance. therefore we reject null hypothesis.
Reject H0: Conclude systems differ
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