A regression model involved 18 independent variables and 200 observations. The critical value of t for testing the significance of each of the independent variable's coefficients will have _____.
a. 18 degrees of freedom
b. 200 degrees of freedom
c. 199 degrees of freedom
d. 181 degrees of freedom
Q. 2The assumption of exponentially distributed service times indicates that
a. 37 of the service times are less than the mean service time.
b. 50 of the service times are less than the mean service time.
c. 63 of the service times are less than the mean service time.
d. service time increase at an exponential rate as the waiting line grows.
Q. 3All calculations are permitted on what type of data?
a. Interval data c. Ordinal data
b. Nominal data d. All of these choices are true.
Q. 4In a multiple regression analysis involving 10 independent variables and 81 observations, SST = 120 and SSE = 42 . The coefficient of determination is ______.
a. .81
b. .11
c. .35
d. .65
Q. 5For many waiting line situations, the arrivals occur randomly and independently of other arrivals and it has been found that a good description of the arrival pattern is provided by
a. a normal probability distribution.
b. an exponential probability distribution.
c. a uniform probability distribution.
d. a Poisson probability distribution.
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