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Problem: To earn more, get married? Data show that men who are married, and also divorced or widowed men, earn quite a bit more than men the same age who have never been married. This does not mean that a man can raise his income by getting married, because men who have never been married are different from married men in many ways other than marital status.
Requirement:
1. Suggest several lurking variables that might help explain the association between marital status and income.
Start rolling dice until a particular number, say 3, is obtained, and keep track of how many rolls are necessary. Repeat 100 times. Then find the average.
How many branch offices were involved in the study and compute the F statistic and test the significance of the relationship at a .05 level of significance.
Rental car gasoline prices per gallon were sampled at eight major airports. Date for Hertz and National car rental companies follow (USA today April 4, 2000)
Many times researchers preselect the value of alpha of .01 or .001. What are the factors that allow selection of either of those levels of significance?
When carrying out a large sample test of H 0 : m =10 vs. H a : m ¹ 10 by using a p-value, we reject H 0 at level of significance α when the p-value is:
a study of 420039 cell phone users found that 131 of them developed cancer of the brain or nervous system. prior to
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
How many ways are there of obtaining 10 patients expressing a preference for drug A. Repeat for 9 patients. 8 patients. ... 1, 0 patients. Tabulate your results - What is the probability of having eight patients express a preference for drug A if ..
No, there is not sufficient information to reject the hypothesis that the proportion of cats and the proportion of dogs that sleep more than 10 hours per day are the same because the test value -0.65 is inside the acceptance region (-1.96,1.96).
Find the percent of a standard Normal model found in the given region. Round to the nearest hundredth of a percent.
A company's records indicate that on any given day, 1% of their day shift employees and 2% of the night shift employees will miss work. Sixty percent of the employees work the day shift. What percent of employees are absent on any given day?
Do the data indicate a significant difference? Test with ∝ = .05.
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