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Question 28 A random sample of 49 cast aluminum pots is taken from a production line once every day. The number of defective pots is counted.

Question 28

  1. A random sample of 49 cast aluminum pots is taken from a production line once every day. The number of defective pots is counted. The proportion of defective pots has been closely examined in the past and is believed to be 0.05. The sample proportions for the week are shown in the accompanying table. 

  2. Day of the WeekProportion DefectiveMonday0.06Tuesday0.07Wednesday0.04Thursday0.06Friday0.05Is the production process in control?
  3. No, because the sample proportions show a downward trend.
  4. Yes, because the sample proportions fall within the upper and lower control limits.
  5. Yes, because the sample proportions show a downward trend.
  6. No, because the sample proportions fall within the upper and lower control limits.

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