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How would you find the control limits if you did have a standard? How would you find the control limits if you had no standard?
Comment on what you see in the percentage chart. In particular, is this process in control? How do you know?
Some of the engines come off the line with too much oil, and others come off with too little. Something has to be done to control the differences.
What is the most important problem, in terms of the number of transmissions affected? What percent of all difficulties does this problem represent?
What is the most important problem, in terms of the number of candies affected? What percent of all difficulties does this problem represent?
What is the most important problem, in terms of the number of certificates affected? What percent of all difficulties does this problem represent?
Consider the X chart shown in Fig. showing the average number of chocolate chips per cookie. Decide whether or not this process is in control.
Comment on what you see in the R chart. In particular, is the variability of this process in control? How do you know?
Write a paragraph, as if to your supervisor, summarizing the situation and defending the action you feel is appropriate.
Setting prices is rarely an easy task. A low price usually results in higher sales, but there will be less profit per sale.
Does training level appear to have a significant impact on annual salary after adjustment for age and experience?
Test whether you have a significant interaction by using a t test for the regression coefficient of the interaction variable.
Find a multivariate data set relating to your work or business interests on the Internet, in your library, in a newspaper, or in a magazine, with a sample.
How is the result of a hypothesis test different from a confidence interval statement?
What standard error would you use to test whether a new observation came from the same population as a sample? (Give both its name and the formula.)
Obtain an estimated value and a standard deviation (either from data or by educated guess) for each of two situations important to your business interests.
What is the reference value? Does it come from the sample data? Is it known or unknown?
How is a paired t-test similar to and different from an ordinary t-test for just one sample?
What can you say about your lifetime track record in terms of correct decisions to accept true null hypotheses?
What new assumption is needed for the unpaired t-test to be valid for small samples? What can you do if this assumption is grossly violated?
Compute your own two-sided 95% confidence interval. Compare your results to the margin of error, if this is reported in your source.
The preliminary survey results just came back on the specialty catalog project, and they look great! The average planned order size was $42.33
Which one usually includes the case of pure randomness? Which one has the burden of proof? Which one has the benefit of the doubt?
Briefly describe the steps involved in performing a two-sided test concerning a population mean based on a confidence interval.
Consider each assumption in turn. What happens if the assumption is not satisfied? What, if anything, can be done to fix the problem?