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Researchers at the University of Houston decided to test the hypothesis that restaurant servers who squat to the level of their customers would receive a larger tip ("Effect of Server Posture on Restaurant Tipping," Journal of Applied Social Psychology [1993]: 678-685). In the experiment, the waiter would flip a coin to determine whether he would stand or squat next to the table. The waiter would record the amount of the bill and of the tip and whether he stood or squatted.
a. Describe the treatments and the response variable.
b. Discuss possible extraneous variables and how they could be controlled.
c. Discuss whether blocking would be necessary.
d. Identify possible confounding variables.
e. Discuss the role of random assignment in this experiment.
For random variables X and Y in Example 4.27, use Matlab to calculate E[X], E[Y], the correlation E[XY], and the covariance Cov[X, Y].
Technology and the Internet In its Millennium Development Goals Report, the United Nations suggested that by the end of 2013 there will be 6.8 billion.
Implantable heart pacemakers contain small circuit boards called substrates. These substrates are assembled, cut to shape, and fired. Some of the substrates will separate, or delaminate, making them useless.
Test the null hypothesis that the population mean is equal to 42 versus the two-sided alternative. Find the p-value for the appropriate hypothesis test.
find probabilty that the average of those counts is more than 83.0 mosquitoes per square meter. Assume the variable is normally distributed.
A random sample of 13 four-cylinder cars is obtained and the breaking distances are measured and found to have a mean of 137.5 ft and a standard deviation of 5.8 ft.
What score would Sandra need to beat 91 percent of her mathematics class? The mean score was 73, and the standard deviation was 12.
An HMO is considering a marketing plan targeting patients with chronic diseases to increase the number getting a flu shot. Some preliminary analyses are conducted before implementing such a plan.
1. Analyze the policy of containment. How did the United States enact this policy?
An automobile rental agency has the following mileages (in thousands) for a simple random sample of 20 cars rented last year. Given this information, and assuming the data are from a population that is approximately normally distributed, constr..
Estimate the numerical values of the medians by using the boxplots.Do these men, or do these women, have greater variation in brain size? Why?
quantitative research questiondownload gpower and play around with it. see how changes in assumptions and parameters
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