A random sample of 135 items is drawn from a population whose standard deviation is known to be ? = 60. The sample mean is = 870.
(a)Construct an interval estimate for ? with 98 percent confidence. (Round your answers to 1 decimal place.)
The 98% confidence interval is from to
(b)Construct an interval estimate for ? with 98 percent confidence, assuming that ? = 120.(Round your answers to 1 decimal place.)
The 98% confidence interval is from to
(c)Construct an interval estimate for ? with 98 percent confidence, assuming that ? = 240.(Round your answers to 1 decimal place.)
The 98% confidence interval is from to
(d)Describe how the confidence interval changes as ? increases.
The interval stays the same as ? increases.
The interval gets wider as ? increases.
The interval gets narrower as ? increases.
The interval gets wider as ? decreases.
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