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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).
To test this claim, a researcher obtains information about registered drivers from the department of motor vehicles and selects a sample of n=300 accident reports from the police department.
Discuss examples where you would use test of hypothesis at your personal or professional life, in your education or society for the following situations:
Find the LCD for the following rational expressions, and convert each rational expression into an equivalent rational expression with the LCD as the denominator.
A group of 47 randomly selected students have a mean score of 20.2 with a standard deviation of 4.6 on a placement test. Construct a 90% confidence interval for the mean score, , of all students taking the test.
A random sample of 500 participants was recruited for the study ? Subjects were allowed to elect to participate in an 3-month exercise program or serve as a control subject (190 chose the program, 310 chose to serve as controls)?
Graph one shows a number of observations that are very spread out but generally trending from the top left of the graph to the bottom right.
Cholesterol levels for women follow a normal distribution with mean = 185 mg/dL and standard deviation = 50 mg/dL. What percent of women have cholesterol levels above 240?
What is the probability density function for this uniform distribution?
Critically discuss the probability that more than 175 cable households rate cable companies as good or excellent in quality transmissions?
Can you think of an example where regression analysis can be used? How is regression analysis being used in a retail environment, or how should it be used?
Four different paints are advertised as having the same drying time. To check the manufacturer's claims, five samples were tested for each of the paints.
A survey on household income in Northeast NJ area gave the following numbers in thousands of dollars:
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