A population has a mean of 300 and a standard deviation of 80. Suppose a sample of size 100 is selected and x is used to estimate . Use z-table. a. What is the probability that the sample mean will be within +-7 of the population mean (to 4 decimals)? b. What is the probability that the sample mean will be within +-11 of the population mean (to 4 decimals)?
Added by Juan Carlos J.
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SE = 80 / √100 SE = 80 / 10 SE = 8 Show more…
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