13. Criteria for a estimating a proportion involve

A. situations which only have a two possible outcomes B. situations which can only have one true outcome

C. the normal distribution

D. all of the above

E. answers A and B

14. Violating a minimum sample size requirement would can jeopardize a(n): A. confidence level

B. error level

C. class width

D. all of the above E. only A and B

15. Consider the diagram below with two curves. Which do you suspect to be the T curve?

Answer B

16. Which is true of the T curve distribution?

Answer A

A. When estimating a population average, the T curve has a larger variance in order to handle correction factor which must be applied to an interval estimate since little is known about

B. When estimating a population proportion, the T curve has a larger variance in order to handle correction factor which must be applied to an interval estimate since very little is known aboutC. When estimating a population average, the T curve has a larger variance in order to handle correction factor which must be applied to an interval estimate since very little is known about the population proportion.

D. When estimating a population average, the T curve has a smaller variance in order to handle correction factor which must be applied to an interval estimate since very little is known about the population proportion.

E. When estimating a population average, the T curve has a larger median in order to handle correction factor which must be applied to an interval estimate since very little is known about the population proportion.

17. Formulas for estimating a population average when sigma is known involving using the ___ Distribution, while formulas for estimating a population average when sigma is unknown involves ___ and formulas for estimating population proportions involve a ___ distribution.

A. T, Z, left -skewed

B. Z, T, T

C. Right skewed, Z, Uniform

D. T, Z, Chebychev

E. None of the above are correct