28 3 29 4 30 6 A large certified public accounting firm has been monitoring the

Question

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A large certified public accounting firm has been monitoring the accuracy of its employees and wishes to get the number of accounts with errors under statistical control. It has sampled 100 accounts for each of the last 30 days and has examined them for errors, with the results shown in the accompanying data. Complete parts a through c below Click the icon to view the counts for accounts with errors a. Construct a p-chart for the account process. Choose the correct graph below 0.1 o 0.0 a 0.04 o 0.0 0.04 0 3 6 9 12 15 18 21 24 27 30 Sample Account 0 3 6 9 12 15 18 21 24 27 30 Sample Account ? ?. 0.0 0.04 o 0.0 0.04 0 3 6 9 12 15 18 21 24 27 30 Sample Account 0 3 6 9 12 15 18 21 24 27 30 Sample Account b. What does the chart indicate about the statistical stability of the process? The process appears to be c. Suppose that for the next 3 days, sample sizes of 100 accounts are examined, and 8, 9, and 10 errors, respectively are discovered on those days. Plot the ?I control. There ?| outside the control limits and there ?| in the data appropriate data on the control chart. Choose the correct graph below ? 0.1 0.0 0.04 o 0.0 0.04 0 3 6 9 12 15 18 21 24 27 30 33 Sample Account 0 3 6 9 12 15 18 21 24 27 30 33 Sample Account O C. 0.0 0.04 o 0.0 0.04 0 3 6 9 12 15 18 21 24 27 30 33 Sample Account 0 3 6 9 12 15 18 21 24 27 30 33 Sample Account Click to select your answer

Explanation / Answer

(a) The correct graph is A.

(b) The process appears to be in control. There are no points outside the control limits and there are no outlier in the data.

(c) The correct graph is B.

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