Suppose you were given data on number of radio ads and sales for a local departm

Question

Suppose you were given data on number of radio ads and sales for a local department store. You had observations for 20 months. The correlation between ads and sales is 0.40. Does this indicate a positive and significant relationship between ads and sales at the 0.005 level of significance? A) Yes B) No C) Not enough information to determine significance

If one examines the relationship between two variables, the correlation (r) and the slope coefficient (b1) in a multiple regression model A) may have opposite signs. B) must have the same signs. C) must have opposite signs. D) are equal.

In a regression model with one independent variable X, the intercept or constant (b0) represents the A) predicted value of the dependent variable Y when the X = 0. B) estimated average per unit change in the dependent variable for every unit change in X. C) predicted or fitted value of dependent variable. D) Average variation around the sample regression line.

Explanation / Answer

Suppose you were given data on number of radio ads and sales for a local department store. You had observations for 20 months. The correlation between ads and sales is 0.40. Does this indicate a positive and significant relationship between ads and sales at the 0.005 level of significance?

C) Not enough information to determine significance

If one examines the relationship between two variables, the correlation (r) and the slope coefficient (b1) in a multiple regression model

A) may have opposite signs.

In a regression model with one independent variable X, the intercept or constant (b0) represents the

A) predicted value of the dependent variable Y when the X = 0.

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