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Category > Management Posted 22 Jan 2018 My Price 6.00

SM Inc

5-89. American Household, SM Inc., produces a wide array of home safety and security products. One of its products is the First Alert SA302 Dual Sensor Remote Control Smoke Alarm. As part of its quality control program, it constantly tests to assure that the alarms work. A change in the manufacturing process requires the company to determine the proportion of alarms that fail the quality control tests. Each day, 20 smoke

 

alarms are taken from the production line and tested, and the number of defectives is recorded. A file

 

 

 

entitled Smokeless contains the possible results from the last 90 days of testing.

 

a. Compute the proportion of defective smoke alarms.

 

b. Calculate the expected number and the standard deviation of defectives for each day’s testing. Assume the proportion of defectives is what was computed in part a. (Hint: Recall the formulas for the mean and the standard deviation for a binomial distribution.)

 

c. To make sure that the proportion of defectives does not change, the quality control manager

 

wants to establish control limits that are 3 standard deviations above the mean and 3 standard deviations below the mean. Calculate these limits.

 

d. Determine the probability that a randomly chosen set of 20 smoke alarms would have a number of defectives that was beyond the control limits established in part c.

 

 

 

 

 

Answers

Maurice Tutor
(5)
Status NEW Posted 22 Jan 2018 05:01 PM My Price 6.00

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