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Travel and Transportation
Over the past several years, Times Square in New York City was made pedestrianonly, and protected bike lanes were added to five avenues in the middle of Manhattan. In addition, a new bike-share program has become extremely popular. As a result of these changes, motor vehicle traffic is actually moving more smoothly into and through Manhattan.8 One measure of better traffic flow is the speed of a taxi ride. After carefully reviewing taxi records, a random sample of similar trips before and after the changes to Times Square were obtained. The average speed (in mph) of each trip was recorded. Use the sign test with a = 0.05 to determine whether there is any evidence that the median speed of a taxi trip is faster after the changes to Times Square. Find the p value associated with this test.
You are given the following frequency distribution for the number of errors 55 students made in a test:
(a) Consider a normal distribution with mean μ = 88. If 2% of the values lie below x = 50, find the standard deviation σ. (b) Consider a normal distribution with standard deviation σ = 15.6. If 10% of the values lie above x = 17.2, find the mean μ.
Anthony is measuring his participants' emotional states in two different ways (self-report and galvanic skin response) in order to gain a greater confidence that he is actually measuring the emotional that he thinks he is.
1. acme corporation manufactures light bulbs. the ceo claims that an average acme light bulb lasts 300 days. a
By using this data and incorporating seasonal effects, predict quarterly turnover for 2010.
Was this a case-control study, a randomized experiment, or an observational study that was not case-controlled?- What are the explanatory and response variables in this study?
The true sampling error is usually not known because
a. Is there a significant (a = 0.05) difference in the four brands of shoes with respect to their mean peak force?
In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic.
the lengths in minutes of a random selection of popular childrens animated films are listed below. estimate the true
For each data set, compute and save g(m hat). Then do the following: Plot the histogram of B values of g(m hat)and sqrt(n)*[g(m hat)- g(m )].
using the december follow-up data listed below is there a significant difference between school a children and school b
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