Question 1

A range of values used to estimate a population parameter is called ______.

a. degrees of freedom

b. the margin of error

c. a point estimate

d. an interval estimate

Question 2

A single value considered as the best estimate of a population parameter is called ______.

a. the margin of error

b. degrees of freedom

c. an interval estimate

d. a point estimate

Question 3

A distribution that is bell-shaped and symmetrical around the mean, without reference to degrees of freedom is called the ________ distribution.

a. interval

b. z

c. point

d. t

Question 4

The greatest distance between the point estimate and the value of the parameter is called ______.

a. a point estimate

b. the margin of error

c. an interval estimate

d. the z-score

Question 5

A distribution that is bell-shaped and symmetrical and uses degrees of freedom is called the _______ distribution.

a. point

b. z

c. interval

d. t

Question 7

When finding a confidence interval and the only standard deviation given is from the sample, what distribution will need to be used within the calculations?

a. z-distribution

b. Normal distribution

c. Distribution of n

d. t-distribution

Question 8

When finding an 88% confidence interval, what percentage of the distribution will end up in one of the tails outside of the confidence interval?

Group of answer choices

a. 6%

b. 88%

c. 2.5%

Group of answer choices

d. 12%

Question 9

Consider this situation, "A company wants to be 95% confident total monthly demand within 50 units, and assumes that the standard deviation of sales will be 84.How many would need to be in the sample?"In this case, what is the maximum error?

a. Cannot be determined

b. . 50

c. 84

d. 95%

Question 10

Which would be wider and why?

a. 90% confidence interval as it would be symmetrical

b. 80% confidence interval as unsure compared with others

c. 99% confidence interval as need to encompass more values to be more sure

d. 95% confidence interval as it is the most common