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\f10. Which statements below about least-squares regression are correct? 1. Switching the explanatory and response variables will not change the least-squares regression line. Il. The slope of the line is very sensitive to outliers in the x direction with large residuals. Ill. A value of r close to I does not guarantee that the relationship between the variables is linear. () Only I is correct. (b) Only 11 is correct. (c) Only III is correct. (d) Both II and III are correct. (e) All three statements-I. 11, and III-are correct. CHAPTER & 1. A new headache remedy was given to a group of 25 subjects who had headaches. Four hours after taking the new remedy. 20 of the subjects reported that their headaches had disappeared. From this information you conclude (a) that the remedy is effective for the treatment of headaches. (b) nothing. because the sample size is too small. (c) nothing. because there is no control group for comparison. (d) that the new treatment is better than aspirin. (e) that the remedy is not effective for the treatment of headaches. 2. We wish to draw a sample of 5 without replacement from a population of 50 households. Suppose the households are numbered 01. 02. ... . 50, and suppose that the relevant line of the random number table is 11362 35692 96237 90842 46843 62719 64049 17823. Then the households selected are (a) households 11 13 36 62 73 (b) households 11 36 23 08 42 (c) households 11 36 23 23 08 (d) households 11 36 23 56 92 () households 11 35 96 90 46 3. A maple sugar manufacturer wants to estimate the average trunk diameter of Sugar Maples trees in a large forest. There are too many trees to list them all and take a SRS. so he divides the forest into several hundred 10 meter by 10 meter plots, selects 25 plots at random, and measures the diameter of every Sugar Maple in each one. This is an example of a (a) multistage sample. (b) stratified sample. (c) simple random sample. (d) cluster sample. (e) convenience sample