A researcher wishes to estimate the textbook costs of first-year students at Barry University. To do so, he recorded the textbook cost of 300 first-year students and found that their average textbook cost was 195 per semester. The variable of interest to the researcher is

a. textbook cost. c. number of students.

b. class rank. d. name of university.

Q. 2For a multiple regression model, SST = 200 and SSE = 50 . The multiple coefficient of determination is ______.

a. .25

b. 4.00

c. 250

d. .75

Q. 3What queue discipline is assumed by the waiting line models presented in the textbook?

a. first-come first-served.

b. last-in first-out.

c. shortest processing time first.

d. No discipline is assumed.

Q. 4The classification of student class designation (freshman, sophomore, junior, senior) is an example of a(n)

a. nominal random variable. c. ordinal random variable.

b. interval random variable. d. a parameter.

Q. 5A regression model in which more than one independent variable is used to predict the dependent variable is called _____.

a. a simple linear regression model

b. a multiple regression model

c. an independent model

d. None of the answers is correct.

Q. 6The arrival rate in queuing formulas is expressed as

a. the mean time between arrivals.

b. the minimum number of arrivals per time period.

c. the mean number of arrivals per channel.

d. the mean number of arrivals per time period.