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Question: An article published in BusinessWeek says that according to a survey by a leading organization 45% of managers change jobs for intellectual challenge, 35% for pay, and 20% for long-term impact on career. If nine managers who recently changed jobs are randomly chosen, what is the probability that
a. Three changed for intellectual challenges.
b. Three changed for pay reasons.
c. Three changed for long-term impact.
In a large metropolitan area 70% of the registered voters are thought to favor a new zoning ordinance. Suppose six hundred voters are chosen at random and interviewed. What is the probability that fewer than half support the ordinance?
The mean serum cholesterol level of 25 men ages 65-74 is 231, with a sample standard deviation of 50. For 25 women of the same age, the mean serum cholesterol level is 255 with a standard deviation of 49. Are the average serum cholesterol levels stat..
An economist was interested in studying the impact of the recession on dining out, including drive-thru meals at fast food restaurants.
B. What would be the important predictors for estimating the Boston housing value and how would these predictors affect the housing value of Boston? We want to figure out the relationship between these predictor variables and the response variabl..
A random sample of 20 patients in a weight loss clinical trial lost an average of 25 pounds over an 8 week period. The sample standard deviation is 10.
Assume the first patient is assigned treatment A, and whenever there is a tie in marginal discrepancy, the next patient is assigned treatment A. Use w0 = 2 and w1 = 1. Show all you work.
Use the sample data to construct the appropriate control chart(s). Does the process appear to be in statistical control?
Her mean waiting time was 7.4 minutes. Assume that the standard deviation has been historically known to be 2.2 minutes. At the .05 significance level, test the claim that the mean waiting time is less than 10 minutes.
Suppose that a simple random sample of n = 5 plots is selected from a study area of N = 100 plots and that the numbers of animals detected in the five plots are 10, 7, 0, 0, and 5, but that the probability of detection for any animal in a selected..
An election poll reported that a candidate had an approval rating of 34% with a margin of error E of 2%. Construct a confidence interval for the proportion of adults who approve of the candidate.
Calculate the test statistic. Determine the p-value of the test-statistic.
Assume that these two numbers are the averages of samples of 15 months each, and that both sample standard deviations are 50. Conduct a test for equality of means using the 0.05 level of significance.
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