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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).
You've administered a standardized test of manual dexterity to two groups of 10 semi skilled workers. One of these two groups of workers will be employed by you to work in a warehouse with many fragile items.
Company are interested in how a new spaghetti sauce made from green tomatoes (and green in color) will compare to their traditional red spaghetti sauce. They are worried that the green color will adversely affect the tastiness scores.
Using the .01 level, what should the researcher conclude? Solve this problem explicitly using all five steps of hypothesis testing, and illustrate your answer with a sketch showing the comparison distribution, the cutoff (or cutoffs), and the scor..
Compute the appropriate Test Statistic to test null hypothesis that mean of population is 4.3 against alternative hypothesis μ ≠ 4.3.
Same survey showed that average length of time each store was in bbusiness is 6 years, with standard deviation of 25 years. Which is more variable, number of magazines or number of years.
Identify the independent and dependent variables, and Construct a nominal, ordinal, and interval level measure for each independent and dependent variable.
If you have a statistical package that computes binomial probabilities, find the probability that at least five funds outperform the market in all 10 years.
Suppose the horses in a large stable have a mean weight of 1464 lbs, and a standard deviation of 111. What is the probability that the mean weight of the sample horses would differ from the population mean by less than 11 lbs if 34 horses are samp..
Are you doubtful of any of these data points? if so why does there show to be a linear relation between degree of stenosis and nuber of reactive nuclei?
The 95% prediction interval for a new patient with a 2-day cholesterol level of 220 is
Suppose that a certain college class contains 54 students. Of these, 34 are sophomores, 35 are psychology majors, and 7 are neither. A student is selected at random from the class.
Recognize and describe potential threats (up to 3) to internal validity.
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