In analyzing the relationship between two variables, a scatter plot can be used to detect which of the following?
A) A positive linear relationship
B) A curvilinear relationship
C) A negative linear relationship
D) All of the above
Q. 2In performing chi-square contingency analysis, to overcome a small expected cell frequency problem, we:
A) combine the categories of the row and/or column variables.
B) increase the sample size.
C) Both A and B
D) None of the above
Q. 3Variation exists naturally in the world around us so all processes and products can be expected to vary.
Indicate whether the statement is true or false
Q. 4In the best subsets approach to regression analysis, if we start with 4 independent variables, a total of 33 different regression models will actually be computed for possible selection as the best model to use.
Indicate whether the statement is true or false
Q. 5A high coefficient of determination (R2 ) implies that the regression model will be a good predictor for future values of the dependent variable given the value of the independent variable.
Indicate whether the statement is true or false
Q. 6In a chi-square contingency analysis, when expected cell frequencies drop below 5, the calculated chi-square value tends to be inflated and may inflate the true probability of ________ beyond the stated significance level.
A) committing a Type I error
B) committing a Type II error
C) Both A and B
D) All of the above
Q. 7In a single exponential smoothing model, finding the forecast value for each period requires having the actual and forecast values from the proceeding period.
This is not possible for the first period, so for the first period one should use the actual value as the forecast value. Indicate whether the statement is true or false
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