State University recently randomly sampled seven students and analyzed grade point average (GPA) and number of hours worked off-campus per week. The following data were observed:
GPA HOURS
3.14 25
2.75 30
3.68 11
3.22 18
2.45 22
2.80 40
3.00 15
2.23 29
3.14 10
2.90 0
A regression model with HOURS as the independent variable has an R-square equal to approximately .46.
Indicate whether the statement is true or false
Q. 2When a regression equation includes a term such as x1x2 where two independent variables are multiplied, this is an interaction term.
Indicate whether the statement is true or false
Q. 3Assume that we have found a regression equation of = 3.6 - 2.4x, and that the coefficient of determination is 0.72, then the correlation of x and y must be about 0.849.
Indicate whether the statement is true or false
Q. 4If one independent variable affects the relationship between a second independent variable and the dependent variable, it is said that there is interaction between the two independent variables.
Indicate whether the statement is true or false
Q. 5A seasonally unadjusted forecast is one that is made from seasonal data without any adjustment for the seasonal component in the time series.
Indicate whether the statement is true or false
Q. 6A complete polynomial model contains terms of all orders less than or equal to the pth order.
Indicate whether the statement is true or false
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