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Dan Allen Drive is a major north-south artery through the NC State campus that connects Hillsborough Street and Western Boulevard. Campus police are concerned that vehicles traveling on Dan Allen Drive often exceed the posted speed limit of 20 miles per hour. To gather data on the speed of vehicles, campus police one day placed a radar speed detector by the side of Dan Allen and recorded the speed of cars over a 15-minute period. The speeds are shown below:
24 29 29 23 25 24 33 26 24 29 27 2622 32 24 21 19 29 31 26 29 31 16
Use the data above to construct a 95% confidence interval for the mean speed μ of vehicles traveling on Dan Allen Drive. (calculate y and s to 3 decimal places).
Test the claim that the proportion of Republican voters in a particular city is less than 40 percent. A random sample of 175 voters was selected and found to consist of 30 p
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A mean of 2000 pounds and a variance of 2500 pounds. Let X be the mean of any sample of 100 ropes selected at random. find the expected value and the standard error of X.
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