Suppose a candidate for public office is favored by only 48% of the voters. If a sample survey randomly selects 2500 voters, the percentage in the sample who favors the candidate can be thought of as a measurement from a normal curve with a mean of 48% and a standard deviation of 1%. Based on this information, how often would such a survey show that 50% or more of the sample favored the candidate?
Answer to relevant QuestionsMath SAT scores for students admitted to a university are bell-shaped with a mean of 520 and a standard deviation of 60. a. Draw a picture of these SAT scores, indicating the cutoff points for the middle 68%, 95%, and 99.7% ...Refer to Example 8.1 on page 167, and the corresponding Figure 8.3 showing the distribution of heights for college women. The mean of the heights is 64.5 inches, and the standard deviation is 2.5 inches. a. Use the Empirical ...Find the percentile for the observed value in the following situations: a. Quantitative reasoning GRE score of 146 (mean 5 151.3, s. d. 5 8.7). b. Stanford-Binet IQ score of 97 (mean 5 100, s. d. 5 15). c. Woman’s height ...The population of the United States rose from about 179 million people in 1960 to about 314 million people in 2012. Suppose you wanted to examine a time series to see if homicides had become an increasing problem over that ...Figure 9.12a, which displays rising postal rates, is an example of a graph with misleading units because the prices are not adjusted for inflation. The graph actually has another problem as well. Use the checklist in ...
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