Packet 5 TestPrep - Test 5A Directions: Work on these...

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Chapter 5 1 Test 5A Test 5A AP Statistics Name: Directions: Work on these sheets. Part 1: Multiple Choice. Circle the letter corresponding to the best answer. 1. What do we call a sample that consists of the entire population? (a) A stratum (b) A multistage sample (c) A mistake. A sample can never be the entire population. (d) A census (e) None of the above. The answer is _________________________. 2. To test the effect of music on productivity, workers are observed. For one month background music is played. For another month, no music is played. This is an example of (a) an independent sample. (b) an observational study. (c) a completely randomized design. (d) a block design. (e) a paired sample. 3. Which of the following is a method for improving the accuracy of a sample? (a) Use no more than 3 or 4 words in any question. (b) When possible, avoid the use of human interviewers, relying on computerized dialing instead. (c) Use large sample sizes. (d) Use smaller sample sizes. (e) None of the above. The answer is _____________________________. 4. We say that the design of a study is biased if which of the following is true? (a) A racial or sexual preference is suspected. (b) Random placebos have been used. (c) Certain outcomes are systematically favored. (d) The correlation is greater than 1 or less than –1. (e) None of the above. The answer is _____________________________. 5. Control groups are used in experiments in order to (a) control the effects of outside variables on the outcome. (b) control the subjects of a study to ensure that all participate equally. (c) guarantee that someone other than the investigators, who have a vested interest in the outcome, controls how the experiment is conducted. (d) achieve a proper and uniform level of randomization. (e) None of the above. The answer is ______________________________.
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Chapter 5 2 Test 5A 6. An experiment was designed to investigate the effect of the amount of water and seed variety upon subsequent growth of plants. Each plant was potted in a clay plot, and a measured amount of water was given weekly. The height of the plant at the end of the experiment was measured. Which of the following is not correct? (a) The response variable is the plant height. (b) The explanatory variables are the amount of water and seed variety. (c) Randomization was used to even out the effect of other possible factors upon the growth of the plants. (d) A possible uncontrollable factor in this experiment is any nutrients that might be present in the clay pots. (e) Designed experiments give the best evidence of “cause-and-effect” relationships. 7. What electrical changes occur in muscles as they get tired? Student subjects hold their arms above their shoulders as long as they can. Meanwhile, the electrical activity in their arm muscles is measured. This is
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Packet 5 TestPrep - Test 5A Directions: Work on these...

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