The z value for 97.8 confidence interval estimation is

Question 1
1.

For the interval estimation of μ when σ is known and the sample is large, the proper distribution to use is

the normal distribution

the t distribution with n degrees of freedom

the t distribution with n + 1 degrees of freedom

the t distribution with n + 2 degrees of freedom

Question 2
1.

An estimate of a population parameter that provides an interval of values believed to contain the value of the parameter is known as the

confidence level

interval estimate

parameter value

population estimate

Question 3
1.

The value added and subtracted from a point estimate in order to develop an interval estimate of the population parameter is known as the

confidence level

margin of error

parameter estimate

interval estimate

Question 4
1.

Whenever the population standard deviation is unknown and the population has a normal or near-normal distribution, which distribution is used in developing an interval estimation?

standard distribution

z distribution

alpha distribution

t distribution

Question 5
1.

The z value for a 97.8% confidence interval estimation is

2.02

1.96

2.00

2.29

Question 6
1.

The t value for a 95% confidence interval estimation with 24 degrees of freedom is

1.711

2.064

2.492

2.069

Question 7
1.

As the sample size increases, the margin of error

increases

decreases

stays the same

increases or decreases depending on the size of the mean

Question 8
1.

The ability of an interval estimate to contain the value of the population parameter is described by the

confidence level

degrees of freedom

precise value of the population mean μ

degrees of freedom minus 1

Question 9
1.

In general, higher confidence levels provide

wider confidence intervals

narrower confidence intervals

a smaller standard error

unbiased estimates

Question 10
1.

An interval estimate is a range of values used to estimate

the shape of the population's distribution

the sampling distribution

a sample statistic

a population parameter

Question 11
1.