Statistics 13C Spring 2009
1) The sample size needed to estimate a population mean within 1.5 units with a 95% confidence when the population standard deviation equals 10 is. A) 121. B) 13. C) 171. D) 54. 2) From a sample of 200 items, 12 items are defective. The point estimate of the population proportion defective will be: A) 12. B) 0.06. C) 16.67. D) 0.12 ................
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