Do bald men have more heart attacks? In a study, the proportion of bald men who

Question

Do bald men have more heart attacks? In a study, the proportion of bald men who have had a heart attack was compared to the proportion of non-bald men that have had heart attacks. Which of the following is true for this study? A. The response variable is whether a man had a heart attack. B. The explanatory variable is whether a man had a heart attack. C. The explanatory variable is whether a man is bald. D. Both (a) and (c). A researcher measures the correlation between two variables. This correlation tells us A. whether there is a relation between two variables. B. whether a scatterplot shows an interesting pattern. C. whether a cause and effect relation exists between two variables. D. the strength and direction of the straight line relation between two variables. The least-squares regression line is A. the line that passes through the most data points. B. the line that makes the sum of the squares of the vertical distances of the data points from the line (the sum of squared residuals) as small as possible. C. the line such that half of the data points fall above the line and half fall below the line. D. all of the above. Suppose the correlation for a set of data is r= .91. Now suppose we remove one single point from the data set, recompute the correlation, and now find that the new r = .13. The point removed would be considered A. robust. B. a residual. C. influential. D. a response.

Explanation / Answer

Solution:-

1) Both A and C

Explanatory variable is whther a man is bald.

Response variable is whther a man had a heart attack.

2) A) Whether there is relation between two variables.

3) The lines taht make a sum of squares of vertical distances of the data points from the line as small as possible.

4) C) Influential

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