The IRS is concerned with improving the accuracy of tax information given by its

Question

The IRS is concerned with improving the accuracy of tax information given by its representatives over the telephone. Previous studies involved asking a set of 25 questions of a large number of IRS telephone representatives to determine the proportion of correct responses. Historically, the average proportion of correct responses has been 71 percent. Recently, IRS representatives have been receiving more training. On April 26, the set of 25 tax questions were again asked of 20 randomly selected IRS telephone representatives. The number of correct answers were:

21, 16, 19, 8, 21, 21, 21, 16, 17, 16, 22, 8, 24, 19, 19, 16, 23, 15, 21, and 16.

To determine he upper and lower control limits for an appropriate p-chart for the IRS, with z = 4, data is entered into OM Explorer as shown below.

a. The entry of defect data is correct.

True

False

b. The entry of the sample size is correct.

True

False

c The entry of the standard deviation for control limits is correct.

True

False

Please indicate the correct answer.

bEnter the sample size below, then enter the number of defects in each sample in the two yellow-tinted 7 columns 0.8975 Compute p-Bar 10 Sample size 20 p-Bar * Enter p-Bar manually Defects in Sample 0.067820996 Compute sigma 13 15 17 21 26 16 27 19 28 8 29 21 30 21 31 21 32 16 33 17 34 16 35 22 36 8 37 24 38 19 39 19 40 16 41 23 42 15 43 21 44 16 45 46 47 48 49 50 sigma Enter sigma manually Std. Dev. For CL's Upper Control Limit 1.33 0.9877 0.8073 19 20 21 Lower Control Limit 23 24 25 26 27 28 29 30 31 32 12 13 15 16 17 19 20 21 35 36 37 23 24 25

Explanation / Answer

Solution:

a). True

b). True

Beacuse the sample size is given as 20

c). False

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