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Public Policy and Political Science
The Dallas, Texas, city council is going to consider a zoning variance for the Estates on Frankford apartment complex so that the developer may extend the structure closer to the nearest road. Some council members are concerned about safety, but they will vote for the measure if more than 60% of all city residents favor the variance. A random sample of residents will be obtained and asked whether they favor the zoning variance. Let p be the true proportion of residents who favor the extended structure.
a. State the null and alternative hypotheses in terms of p.
b. Describe a type I error and a type II error in this context.
c. Which error is more serious for the developer? Why?
d. Which error is more serious for the city council members? Why?
The average number of typos on one page of a manuscript is 8. What is the probability that 4 to 6 type appear on 2 pages of the manuscript? Imagine Poisson distribution.
Fit the first-order model to the data.- Calculate the residuals and construct a residual plot versus y^.- What does the plot from part b suggest about the variance of y?
The Ntional Lightning Detection Newtowk uses automatic sensors to watch for lightning in areas of 10 square kilometers. What are the mean and standard deviation of the total number of lightning strikes observed?
A computer network manager wants to test the reliability of some new fiber optic cables that the department just received. The department received 4 boxes, each containing 30 cables.
Based on a study of IQs of men and women who play chess competitively, a researcher concludes that playing chess causes people to become smarter. Do you agree with this conclusion?
If we wish to be 95% certain of avoiding a Type I error, use these data to examine differences in the average distance traveled to the two clinics.
Election officials take a random sample of 100 signatures and thoroughly investigate them to find that 84% are valid. Is this statistically significant evidence that the candidate has enough valid signatures overall? Explain.
Compare and contrast the shopping process at a bricks and mortar store such as Macy's or Target and at an Internet retailer such as Amazon.com. How are these processes different? (Hint: Consider the process steps, the inputs, outputs, resources, a..
JBGHI demands a sample large enough to ensure an error of ± 2% with 90% confidence. What is the necessary sample size?
Suppose we ask the students to volunteer to be in the rereading group. We accept students into this group one at a time until we have the number needed. Evaluate this strategy for assigning students to the two groups.
for binomial distribution with n 10 and probability of success p 0.4 find probability of less than 3 successes x lt 3
How many times in a row would you have to lose in order to be pretty sure that this friend really can control the toss?
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