Review ch 5 - 1. Can pleasant aromas help a student learn...

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Page 1 1. Can pleasant aromas help a student learn better? Two researchers believed that the presence of a floral scent could improve a person's learning ability in certain situations. They had 22 people work through a pencil-and-paper maze six times, three times while wearing a floral-scented mask and three times wearing an unscented mask. The three trials for each mask closely followed one another. Testers measured the length of time it took subjects to complete each of the six trials. They reported that, on average, subjects wearing the floral-scented mask completed the maze more quickly than those wearing the unscented mask, although the difference was not statistically significant. This study is A) a convenience sample. B) an observational study, not an experiment. C) an experiment, but not a double-blind experiment. D) a double-blind experiment. A television station is interested in predicting whether voters in its viewing area are in favor of federal funding for abortions. It asks its viewers to phone in and indicate whether they support/are in favor of or are opposed to this. Of the 2241 viewers who phoned in, 1574 (70.24%) were opposed to federal funding for abortions. 2. What kind of sample was taken? 3. Referring to the information above, the sample obtained is A) a simple random sample. B) a single-stage sample.
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This note was uploaded on 12/20/2010 for the course STAT 3311 at University of Houston.

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Review ch 5 - 1. Can pleasant aromas help a student learn...

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