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Standard deviation for the sample proportion

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Reference no: EM131007151

One of the ways in which the dental floss discussed in Exercise 5 can fail is if it snaps when pulled with a certain tension. Historically, only 2% of the tested floss snaps. Suppose boxes of size 50 are selected at random to be tested.

a) What is the standard deviation for the sample proportion from a box of 50?

b) What are the upper and lower 3s control limits?

c) How many packages in a box of 50 would have to fail for a process to be declared out of control using the 3s control limits?

Reference no: EM131007151

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