SME_8e_Ch_21_Section_4 - CHAPTER 21 SECTION 4: STATISTICAL...

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1 CHAPTER 21 SECTION 4: STATISTICAL PROCESS CONTROL MULTIPLE CHOICE 105. Control charts that are used to monitor a process whose results are categorized as either defective or nondefective are called: a. p chart b. S chart c. x chart d. None of these choices. ANS: A PTS: 1 REF: SECTION 21.4 106. If the lower control limit for the p chart is negative, we set it equal to a. 2 b. 1 c. 0 d. None of these choices. ANS: C PTS: 1 REF: SECTION 21.4 107. Forty samples of size 800 were drawn from a manufacturing process and the number of defectives in each sample was counted. The mean sample proportion was 0.035. The lower control limit for the p chart is: a. 0.0350 b. 0.0155 c. 0.0505 d. 0.0545 ANS: B PTS: 1 REF: SECTION 21.4 108. Twenty samples of size 1,500 were drawn from a manufacturing process and the number of defectives in each sample was counted. The mean sample proportion was 0.020. The upper control limit for the p chart is: a. 0.0200 b. 0.0236 c. 0.0199 d. 0.0308 ANS: D PTS: 1 REF: SECTION 21.4 TRUE/FALSE 109. Forty samples of size 2,500 were taken from a production process that is under control. The mean of the sample proportions of defectives was 0.05. The lower control limit for the 3-sigma p chart is 0.0369. ANS: T PTS: 1 REF: SECTION 21.4
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2 110. Control limits for the p chart are typically placed so that they are 3 standard errors above and below the centerline. ANS: T PTS: 1 REF: SECTION 21.4 111. When the purpose of sampling is to detect when a process becomes too variable, the chart of choice will be a p chart. ANS: F PTS: 1 REF: SECTION 21.4 112. The p chart is an example of control charts for attributes. ANS: T PTS: 1 REF: SECTION 21.4 113. Fifty samples of size 1,000 were drawn from a manufacturing process and the number of defectives in each sample was counted. The mean sample proportion was 0.05. The centerline for the p chart is 50. ANS: F
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SME_8e_Ch_21_Section_4 - CHAPTER 21 SECTION 4: STATISTICAL...

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