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1. Suppose you hear an "old-timer" say, "Why, in my day, kids were much more respectful and didn't cause as much trouble as they do nowadays!" Formulate a hypothesis related to this statement that you could test. How would you test it?
2. Researchers routinely choose an ◊-level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower ◊-level (e.g., 0.01)? What are some situations in which you might accept a higher level (e.g., 0.1)?
3. How large would your population have to be for a sample to be appropriate (i.e., rather than measuring the whole population)?
A female student wants to determine whether or not students at the college like the cafeteria's food. Why might the results of this survey be inaccurate?
Based on the sample findings, estimate the true mean of Saturday sales with 90% probability.
One reads that a business school graduate with an undergraduate degree earns more than a high school graduate with no additional education, and a person with a master's degree or a doctorate earns even more.
The quality control director for a clothing manufacturer wants to study the effect of operators and machines on the breaking strength (in pounds) of wool serge material. Is there an interaction between operator and machine?
Compute the relative dispersion of each group using the coefficient of variation. Comment on the difference in relative dispersion.
Construct a 95% confidence interval on the population mean for the following sample data set:
question the mean of a normal probability distribution is 60 the standard deviation is 5.a what percent of the
Use the interaction plot to argue that the new design is less sensitive to changes in environmental conditions (temperature and humidity). What limitations apply to this argument?
The number of smokers among 120 randomly selected students will vary from group to group. Explain why that number can be described wit a normal model.
Find out sample standard deviation (s) of scores Gordon Golfer made on his last four rounds (determine to the nearest one tenth, or .1).
Assume that the cost for this type of hospital emergency room visit is normally distributed with a standard deviation of $92. Assume that the following questions about the cost of a hospital emergency room visit for this medical service.
Gain follows the modern practice of using probability estimates of sales. The military division estimates its sales as follows. Find the standard deviation of the estimated profit, Z = 2000X + 3500Y.
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