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A manager hopes to improve the sales figures for 10 employees by sending them to a motivational seminar. To test the effectiveness of this seminar, the manager compares the sales figures for each salesperson for the month immediately prior to the seminar and the month immediately following it.
Employee before after
Homer 19 12
Bart 6 18
Lisa 9 12
Marge 5 7
Maggie 9 14
Ned 8 17
Milhouse 11 9
Willie 11 17
Stu 11 12
Gill 7 7
Run a statistical hypothesis test and determine if the seminar significantly improved sales figures for the company
At the .05 level of significance, is there evidence of a difference in the mean ontime percentages for the 25 airports between September 2009 and September 2010?
In a random sample of 80 items, the defect rate is 5% but the manager claims that this is only a sample fluctuation and production is not really out of control. At the 0.01 level of significance, does the data provide sufficient evidence that the ..
A fastener manufacturing company uses a chi-square goodness of fit test to determine if a population of all lengths of ¼ inch bolts it manufactures is distributed according to a normal distribution.
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
How do I construct an example where I would be able to apply the concept of expected value to a problem (e.g. a financial investment problem would be a great way to demonstrate how various stocks in a portfolio produce a weighted average of the ov..
Simulate the arrival of cars at the service station for 20 arrivals and compute the average time between stations and Simulate the arrival of the cars at the service station for 1 hour
Determine the average score for ERAU graduates? Determine the value of test statistic? Significance level?
Interpret a scatter diagram - Explain the relationship between the hours each student of a school spends in after school jobs each week and their grade average.
Two semiconductor factories are being compared to see if there is a difference in the average defect rates of the chips they produce. In the first factory, 250 chips are sampled. In the second factory, 350 chips are sampled. The proportions of def..
Think of a case in which regression analysis was used, but not properly. For instance, discuss situations in which regression analysis is not appropriate and does not add useful information to our understanding of a set of data.
A researcher estimates an AR(1) model with an intercept and finds that the OLS estimate of Beta1 is 0.95, with a standard error of 0.002.
Compute the proportion p (hat) for your sample Show your computation. Find a 95% confidence interval for p. What is the margin of error in this confidence interval? What is the meaning of this interval with respect to your data and project?
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