AP Stat Chapter 4 Practice 1 Answers

# AP Stat Chapter 4 Practice 1 Answers - Name Date AP...

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Name Date AP Statistics: Chapter 4 Practice 1 Part 1: Multiple Choice . Circle the letter corresponding to the best answer . 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 (e) 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

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4 . A researcher for a consumer products company is field testing a new formula for laundry detergent. He has contracted with 60 families, each with two children, who have agreed to test the product. He randomly assigns 30 families to the group that will use the new formula and 30 to the group that will use the company’s current detergent formula. The most important reason for this random assignment is that (a) randomization makes the analysis easier since the data can be collected and entered into the computer in any order. (b) randomization eliminates the impact of any confounding variables. (c) randomization is a good way to create two groups of 30 families that are as similar as possible, so that comparisons can be made between the two groups. (d) randomization ensures that the study is double-blind. (e) randomization reduces the impact of outliers.
• Fall '16
• Mr.Gale
• Statistics, Randomness, Simple random sample, speciﬁc storage time

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