Question: Statistics A random sample of 130 items is drawn from a population whose standard deviation is known to be o = 60. The sample mean

Statistics

A random sample of 130 items is drawn from a population whose standard deviation is known to be o = 60. The sample mean is x = 770. (a) Construct an interval estimate for / with 95 percent confidence. (Round your answers to 1 decimal place.) The 95% confidence interval is from to (b) Construct an interval estimate for / with 95 percent confidence, assuming that o= 120. (Round your answers to 1 decimal place.) The 95% confidence interval is from to (c) Construct an interval estimate for / with 95 percent confidence, assuming that o= 240. (Round your answers to 1 decimal place.) The 95% confidence interval is from to

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