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For a population with a standard deviation of

For a population with a standard deviation of σ = 20, how large a sample is necessary to have a standard error that is:

a. less than or equal to = points?

b. less than or equal to 2 points?

c. less than or equal to 1 point?

a. less than or equal to = points?

b. less than or equal to 2 points?

c. less than or equal to 1 point?

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