Question #1

Determine whether the value is a discrete random variable, continuous random variable, or not a random variable.

a. The squarefootageofahouse

b. The amountofraininCityBduringApril

c. The responsetothesurveyquestion"Didyousmokeinthelastweek?"

d. The heightofarandomlyselectedgiraffe

e. The numberoftextbookauthorsnowsittingatacomputer

f. The timeittakesforalightbulbtoburnout

a. Is the squarefootageofahouse a discrete random variable, a continuous random variable, or not a random variable?

A. It is a continuous random variable.

B. It is a discrete random variable.

C. It is not a random variable.

b. Is the amountofraininCityBduringApril a discrete random variable, a continuous random variable, or not a random variable?

A. It is a discrete random variable.

B. It is a continuous random variable.

C. It is not a random variable

c. Is the responsetothesurveyquestion"Didyousmokeinthelastweek?" a discrete random variable, a continuous random variable, or not a random variable?

A. It is a continuous random variable.

B. It is a discrete random variable.

C. It is not a random variable.

d. Is the heightofarandomlyselectedgiraffe a discrete random variable, a continuous random variable, or not a random variable?

A. It is a continuous random variable.

B. It is a discrete random variable.

C. It is not a random variable.

e. Is the numberoftextbookauthorsnowsittingatacomputer

a discrete random variable, a continuous random variable, or not a random variable?

A. It is a continuous random variable.

B. It is a discrete random variable.

C. It is not a random variable.

f. Is the timeittakesforalightbulbtoburnout a discrete random variable, a continuous random variable, or not a random variable?

A. It is a discrete random variable.

B. It is a continuous random variable.

C. It is not a random variable.

Question #3

Determine whether the given procedure results in a binomial distribution (or a distribution that can be treated as binomial). If the procedure is not binomial, identify at least one requirement that is not satisfied.

The YSORT method of sex selection, developed by the Genetics & IVF Institute, was designed to increase the likelihood that a baby will be a boy. When 110 couples use the YSORT method and give birth to 110 babies, the sex of the babies is recorded.

Does the procedure represent a binomial distribution?

A. No, because there are more than two categories for each trial.

B. Yes, because the procedure satisfies all the criteria for a binomial distribution.

C. No, because the trials of the procedure are not independent.

D. No, because the probability of success differs from trial to trial.

Question #16

Which of the following is NOT true about P-values in hypothesis testing?

Choose the correct answer below.

A. If the P is low, the null must go.

B. The P-value separates the critical region from the values that do not lead to rejection of the null hypothesis.

C. The P-value is an area.

D. If the P is high, the null will fly.