INTERVAL ESTIMATION

MULTIPLE CHOICE QUESTIONS

In the following multiple choice questions, circle the correct answer.

1.When s is used to estimate (, the margin of error is computed by using a.normal distribution

b.t distribution

c.the mean of the sample

d.the mean of the population

Answer: b

2.As the number of degrees of freedom for a t distribution increases, the difference between the t distribution and the standard normal distribution

a.becomes larger

b.becomes smaller

c.stays the same

d.None of these alternatives is correct.

Answer: b

3.For the interval estimation of ( when ( is known and the sample is large, the proper distribution to use is

a.the normal distribution

b.the t distribution with n degrees of freedom

c.the t distribution with n + 1 degrees of freedom

d.the t distribution with n + 2 degrees of freedom

Answer: a

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

a.confidence level

b.interval estimate

c.parameter value

d.population estimate

Answer: b

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

a.confidence level

b.margin of error

c.parameter estimate

d.interval estimate

Answer: b

6.If an interval estimate is said to be constructed at the 90% confidence level, the confidence coefficient would be

a.0.1

b.0.95

c.0.9

d.0.05

Answer: c

7.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?

a.standard distribution

b.z distribution

c.alpha distribution

d.t distribution

Answer: d

8.In interval estimation, the t distribution is applicable only when

a.the...

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