We're trying to show that the true percent of people who had twins is less than 20%. Which test should we use?

Group of answer choices

t-test

z-test

confidence interval for

confidence interval for P

We'll usep^to make inferences about P.

Group of answer choices

True

False

We're trying to show that the average age of college students is greater than 19. Would this be an example of point or interval estimation?

Group of answer choices

Point

Interval

We'll useto make inferences about2s2

Group of answer choices

True

False

We're trying to show that the true average amount that Americans have in savings is less than $4,000. Which test should we use?

Group of answer choices

t-test

z-test

confidence interval for

confidence interval for P

We're trying to find a range of values for the average amount of money that Americans have in a savings account. Would this be an example of point or interval estimation?

Group of answer choices

Point

Interval

Which confidence level will provide the widest interval?

Group of answer choices

70%

85%

95%

99%

A confidence interval guarantees that the parameter is contained within the interval.

Group of answer choices

True

False

We can't use confidence intervals to compare two group means.

Group of answer choices

True

False

We're trying to find a range of values for which a true percent of people who have had twins. Which test should we use?

Group of answer choices

t-test

z-test

confidence interval for