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The captain of each precinct of a metropolitan police department selected two officers to participate in a program designed to reduce prejudice by increasing sensitivity to racial and ethnic group differences and community issues. The training program took place every Friday morning for 3 months.
At the first and last meetings, the officers completed a measure of prejudice.
To assess the effectiveness of the program, the average prejudice score at the first meeting was compared with the average score at the last meeting; it was found that the average score was in fact lower following the training program.
What type of design is this? What specific problems arise if you try to conclude that the training program was responsible for the reduction in prejudice?
A major DVD-of-the-month club collected data on the reasons for returned shipments during a quarter. Results are: Wrong Selection, 50,000; Refused, 195,000; Wrong Address, 68,000; Order Canceled, 5000; and Other, 15,000. Construct a Pareto diagram..
(a) What Z value would be appropriate for a 98%service level? (b) What safety stock should Ross maintain if hewants a 98% service level? (c) What is the adjusted ROP for the brackets?
The waiting times have a standard deviation of 4.9 minutes. Use a 0.025 significance level to test the claim that with a single line, waiting times vary less than with individual lines.
Use the t-distribution and the sample results to complete the test of the hypotheses. Use a 5% significance level. Assume the results come from a random sample, and if the sample size is small, assume the underlying distribution is relatively norm..
If a group of 10 printers is chosen at random from the store, find the mean and variance of the number of ink jet printers.
If the restaurant stocks 400 hamburgers and 150 chicken sandwiches for a given day, what is the probability that it will run out of hamburgers or chicken sandwiches (or both) that day? Assume that the demand for hamburgers and the demand for chick..
What is the mean and standard deviation of the daytime waiting times? and what is the mean and standard deviation of the nighttime waiting times?
Discuss in groups and comment on the statement that if managers learned how to conduct research by taking a course such as this there would no need to seek outside consultant help to solve their problems.
Two researchers are both interested in the relationship between caffeine consumption and activity level for elementary school children. Each obtains a sample of n = 20 children.
a) Define the decision variables? How many decision variables are there in total? b) What is the objective function? c) What are the constraints including the sign and type restrictions?
In the survey of 8000 women, 5431 say they change their nail polish once the week. Create the 99% confidence interval for population proportion of women who change their nail polish once a week.
a randomized trial is conducted to evaluate the efficacy of a new cholesterol lowering medication. the primary
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