The following information applies to the questions displayed

[The following information applies to the questions displayed below.]

Construct an interval estimate for ? with 98 percent confidence. (Round your answers to 4 decimal places.)

Construct an interval estimate for ? with 98 percent confidence, assuming that ? = 80. (Round your answers to 4 decimal places.)

Construct an interval estimate for ? with 98 percent confidence, assuming that ? = 160. (Round your answers to 4 decimal places.)

A random sample of 110 items is drawn from a population whose standard deviation is known to be ? = 40. The sample mean is = 750.

A random sample of 110 items is drawn from a population whose standard deviation is known to be ? = 40. The sample mean is x = 750. Construct an interval estimate for ? with 98 percent confidence. (Round your answers to 4 decimal places.) Construct an interval estimate for ? with 98 percent confidence, assuming that ? = 80. (Round your answers to 4 decimal places.) Construct an interval estimate for ? with 98 percent confidence, assuming that ? = 160. (Round your answers to 4 decimal places.)

Solution

If(n ? 30)
Confidence Interval = x