Telephone inquiries of 100 IRS \"customers\" are monitored daily at random Incid

Question

Telephone inquiries of 100 IRS "customers" are monitored daily at random Incidents of incorrect information or other nonconformities (such as impoliteness to custome recorded. The data for last week follow Day No. of Nonconformities 18 a) Using 3 standard deviations, the o-chart for the nonconformities is UCLe·nonconformities (round your response to two decimal places). CL nonconformities (round your response to two decimal places and i your answer ia negative, enter this value as b) According to the o-chart, there | variation in the incidents of incorrect information given out by the IRS telephone operators.

Explanation / Answer

a) c = count / n = (2+6+18+9+8)/5 = 8.6

UCLc = c+3c = 8.6+38.6 = 17.40

LCLc = Max{0, c-3c } = Max {0, 8.6-38.6 = 0

b) Number of noncomformities on day 3 are more than UCL. Therefore, According to the c-chart, there is assignable variation in the incidents of incorrect information given out by the IRS telephone operators.

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