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The results of a recent study regarding smoking and three types of illness are shown below. The illnesses are Emphysema, Heart Problem, and Cancer. Under nonsmokers there were 20 with emphysema, 70 with heart problems and 30 with cancer for a total of 120. Under smoker there were 60 with emphysema, 80 with hear problems and 40 with cancer for a total of 180. The totals for emphysema were 80, for heart problems 150 and for cancer 70 and a grand total of 300 in the study We are interested in determining whether or not illness is independent of smoking.Conduct the appropriate test at an alpha level of 0.05 Columns are Illness--Nonsmoker--Smoker--Totals and the rows are the three illnesses and a total row.
The running time for videos is normally distributed with mean 390 and standard deviation 148. suppose a sample of 40 videos are selected, what is the probability that the mean running time of the sample exceeds 360 seconds?
A seven year old study reported that women whose mothers used the drug DES during pregnancy were twice as likely to develop tissue abnormalities that might lead to cancer as women whose mothers did not take the the drug.
Is there evidence of a difference in the median performance between the two methods? (Use x = 0. 05).
At.05 level of significance, is there evidence to propose that mean life length of batteries produced by this manufacturer is more than 400 hours?
For a random sample of 12 observations, the sample mean was 407 and the sample standard deviation 6. Using the .01 significance level: State the decision rule.
Develop and solve a linear optimization model to determine the optimal mix to maximize profit, and write a short memo to the president, Kathy Chung, explaining the sensitivity information in language that she can understand.
Florida consumers are confident about the economy. verify the 90% confidence interval. State in a sentence the meaning of the derived confidence interval .494, .568. What would be your conclusion?
Can you determine the number of levels used for each factor? Explain. Describe a treatment for this experiment and determine the number of treatments used.
Nicotine patches are often used to help smokers quit. Does giving medicine to fight depression also help? A randomized double blind experiment assigned 244 smokers to receive nicotine patches and another 245 to receive both a patch and the antidep..
Critique the HR manager's planned approach and give him advice on how to proceed. You can assume that a reasonable estimate for the proportion of new hires that are happy with the company is .8.
Find the z-score for a car driving 20 mph in this construction zone. It is an outlier (assume the data is bell shaped, so dont actually test it with pearsons index).
The president of Doerman Distributors, Inc., believes that 30% of the firm's orders come from first-time customers. A random sample of 100 orders will be used to estimate the proportion of first-time customers. Assume that the president is correct..
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