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Business 2.0's first annual employment survey provided data showing the typical annual salary for 97 different jobs. The following data show the annual salaries for 30 different workers in computers, construction, and engineering (Business 2.0, March 2003).
Excel or Minitab users: The data set is available in file named JobSalary. All data sets can be found in your eBook or on your Student CD.
Use = .05 to test for a significant difference among the mean annual salaries for the three job fields.
a) Set up the null and alternative hypotheses, and perform the hypothesis test. b) Based on these results, does the diet appear to be effective? Does the diet appear to have practical significance?
How should she proceed? What additional data (if any) is needed? Which statistical analysis technique should be used? Can an analysis be performed? Why or why not?
How can you tell when you should use the ANOVA versus a t-test? What is one problem with using the ANOVA when the t-test is the appropriate data analysis?
Determine the probability that the number of people who show up will exceed the capacity of the plane?
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SmartPeople is an organization that only admits people with IQ's in the top 98 percentile. What IQ score would a person need to be a member of SmartPeople?
The null hypothesis is to be tested at 95% confidence. Determine the critical values for this test.
Find the standard error of mean. Also establish an interval estimate around the sample mean using one standard deviation of the mean.
Four brands of lightbulbs are being considered for use in the final assembly area of the Saturn plant in Spring Hill, Tennessee. The director of purchasing asked for samples of 100 from each manufacturer.
Although the two samples have an identica winning percentage,one is significant and the other is not. Explain why the two samples lead to different conclusions.
Pools sells above ground model for 'p' dollars each. The monthly revenue from the sale of the pool is given by
Assume that causes of heart failure between individuals are independent. What is the probability that three individuals have conditions caused by outside factors?
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