State which type of parameter is to be estimated, and the correct method for thefollowing.Do notsolve.

Part 1 of 3

(a) A simple random sample of size

36

has mean

=x3.91

.The population standard deviation is

=1.63

.Construct a

99%

confidence interval for the populationmean.

The parameter is the population mean.The correct method to find the confidence interval is the t method.

Part 2 of 3

(b) A simple random sample of size

20

has mean

=x3.31

.The population standard deviation is

=1.55

.The population is approximately normallydistributed.Construct a

95%

confidence interval for the populationmean.

The parameter is the population mean.The correct method to find the confidence interval is the t method.

Part:2 / 3

2 of 3 Parts Complete

Part 3 of 3

(c) In a simple random sample of

490

voters,

200

said that they were planning to vote for the incumbent mayor in the nextelection.Construct a

90%

confidence interval for the proportion of voters who plan to vote for the incumbent mayor in the nextelection.

The parameter is the population proportion.The correct method to find the confidence interval is the z method.