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A researcher is interested in studying the relationship between salary levels and unionization for public employees. Specifically, the researcher hypothesizes that public sector employees who are unionized have higher salary levels than public sector employees not unionized. Random sampling police departments in 100 cities, the researcher constructs the cross-tab below.
Salary
Union
Nonunion
TOTAL
High
21
29
50
Low
14
36
35
65
100
Change the frequencies to percentages - is there a group more likely to get high salaries.
What is the expected number of customers that will have to wait more than 6 hours?
Using Analysis of Variance (ANOVA) test at 5% level if there are important differences in mean sales calls made across the three branches.
Five test vehicles of each kind were crashed, with results given below. Research question: Are mean crash damages the same for these 3 vehicles?
Explain clearly, in your own words, what is a Type I error in this context.
An automobile insurance company estimates the following loss probabilities for the next year on a $25,000 sports car:
The 95% prediction interval for a new patient with a 2-day cholesterol level of 220 is
A faculty group wants to determine whether job rating (x) is a useful linear predictor of raise (y). Consequently, the group considered the linear regression model:
Gas consumption of 3 cars (labeled car A, car B, and car C) using 4 different kinds of gasoline. Is there difference among kinds of gasoline?
Calculate the suitable mean response time from both proposed locations and find out which proposed site must be selected for the new emergency facility.
Suppose the likelihood that any flight on Northwest Airlines arrives within 15 minutes of scheduled time is .90. We choose four flights from yesterday for study.
At the 0.05 level of significance, is there evidence of a significant relationship between the age groups and where people primarily get their news? If so explain the relationship.
Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer.
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