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The recent default rate on all student loans is 5.2 percent, in a random sample of 300 loans with 9 defaults. Does this sample show sufficient evidence that the private university loan default rate is beloww the rate for all universities, using a left-tailed = .01. That is, do you reject the null hypothesis?
A political strategist believes that less than 55% of voters in a certain state support a particular issue. He then commisions a poll of 500 voters and 54% of them support this issue. If = .05, is the political strategist's belief warranted?
A national survey of restaurant employees found that 75% said work stress had a negative impact on their personal lives. A sample of 100 employees from a popular restaurant chain finds that 68 answer
Suppose the regression equation that has been used to estimate the value of existing homes is as follows; Interpret the meaning of the slopes of this equation.
Use these data to obtain a 90% confidence interval estimate for the mean starting monthly salary, µ, of all recent graduates with bachelor's degrees in marketing from this university.
Coke cans: n=36, mean of values in sample = 12.19 oz., s= 0.11 oz. Test the claim that the mean equals 12 oz. Use a significance level of alpha = 0.02.
The cost for the conference room, instructor compensation, lab assistants, and promotion is $9,600. Micromedia rents computers for its seminars at a cost of $60 per computer per day. Question: find the breakeven point for this problem using Excel.
An independent financial advisor claims an average rate of return, μ, on a particular investment is at least 7%. In testing her claim, the correct pair of hypotheses is:
Use SPSS to make a scatterplot between stress and coping, and then add the fitted regression line to the plot. Mark both intercept and slope on the plot (You may consider to change the default X scale in SPSS)
Statistics is science of conducting studies to: Solve a system of equations.
Explain the meaning of the conditional mean of the dependent variable in the population regression function. Illustrate using an example.
Find out the mean for your 3 numbers. They signify your neighborhood's news-viewing habits. Mean is number of news programs viewed in neighborhood each week.
Inspect table produced in question 2 above. Comment on relative sensitivity of minimum sample size to actual proportion and to desired half width.
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