Chapter 1: Problem 42
State whether or not the sampling method described produces a random sample from the given population. The population is all employees at a company. All employees are emailed a link to a survey.
Chapter 1: Problem 42
State whether or not the sampling method described produces a random sample from the given population. The population is all employees at a company. All employees are emailed a link to a survey.
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Get started for freeTo examine whether planting trees reduces air pollution, we find a sample of city blocks with similar levels of air pollution and we then plant trees in half of the blocks in the sample. After waiting an appropriate amount of time, we measure air pollution levels.
In Exercise \(1.18,\) we ask whether experiences of parents can affect future children, and describe a study that suggests the answer is yes. A second study, described in the same reference, shows similar effects. Young female mice were assigned to either live for two weeks in an enriched environment or not. Matching what has been seen in other similar experiments, the adult mice who had been exposed to an enriched environment were smarter (in the sense that they learned how to navigate mazes faster) than the mice that did not have that experience. The other interesting result, however, was that the offspring of the mice exposed to the enriched environment were also smarter than the offspring of the other mice, even though none of the offspring were exposed to an enriched environment themselves. What are the two main variables in this study? Is each categorical or quantitative? Identify explanatory and response variables.
In Exercises 1.36 to 1.39 , a biased sampling situation is described. In each case, give: (a) The sample (b) The population of interest (c) A population we can generalize to given the sample To estimate the proportion of Americans who support changing the drinking age from 21 to \(18,\) a random sample of 100 college students are asked the question "Would you support a measure to lower the drinking age from 21 to \(18 ?\) "
For the situations described. (a) What are the cases? (b) What is the variable and is it quantitative or categorical? Record the percentage change in the price of a stock for 100 stocks publicly traded on Wall Street.
The Hardee's Restaurant chain has about 1900 quickserve restaurants in 30 US states and 9 countries. \(^{33}\) Suppose that a member of the Hardee's administration wishes to visit six of these restaurants, randomly selected, to gather some first-hand data. Suppose the restaurants are numbered 1 to 1900 . Use a random-number generator or table to select the numbers for 6 of the restaurants to be in the sample.
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