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Eleven male subjects responded to an attitude questionnaire designed to evaluate their tendency to view women in stereotypic roles. A month later they were shown a film that illustrated the ways in which women have often been treated unfairly relative to men. Four months later the subjects again responded to the attitude questionnaire. The subjects' scores on the questionnaire (the higher the score, the greater the bias) before and after were as follows:
Subject: A B C D E F G H I J K
Before: 21 25 31 26 21 31 28 24 27 24 22
After: 13 26 35 24 17 24 22 27 17 19 18
(a) Conduct a non directional test for a difference in response between the two sets of data. Use the Wilcoxon signed-ranks test and the 5% significance level.
(b) Calculate effect size.
(c) Do you feel that the way the study was conducted was adequate? Explain. 14. Rework Problem 13a using the large sample (z) Wilcoxon approach.
With reference to Exercise 40, what can we say with 95% confidence about the maximum error if we use the observed sample proportion as an estimate of the corresponding true proportion?
A researcher is deciding whether to use a sample size of 100 or whether to increase the sample size to 200. Explain how this choice will affect the power.
Ear Infections and Xylitol For Example I, children were randomly assigned to take xylitol or a placebo in a clinical trial done to see if xylitol might reduce.
question jenson solberg and zorn investigated the relationship of insider ownership debt and dividend policies in
Calculate a 95% confidence interval for the population proportion. Interpret the interval in a way that could be understood by a statistically naïve reader.
Estimate the probability of rejecting a batch if the supplier is manufacturing the bolts with a defect rate of 10%. Is this monitoring plan likely to identify the unacceptable rate of defects?
identify two important operating standards that are routinely measured in your organization. these measures must meet
consider the probability function. give your answers correct to two decimal places. rx 0.2 for x 0 1 2 3 4 a find the
Best's Review (June 1999) compared the mortgage loan portfolios for a sample of 25 life health insurance companies. The information in the table on page 629 is extracted from the article.
Consider the rollout algorithm for the traveling salesman problem using as base heuristic the nearest neighbor method, whereby we start from some simple path and at each iteration, we add a node that does not close a cycle and minimizes the cost o..
Use a test of the difference between proportions when answering these questions.
Alice and Bob have just met, and wonder whether they have a mutual friend. Each has 50 friends, out of 1000 other people who live in their town.
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