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A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. What is the value of your test statistic.
What type of error would result in that case? Respond to at least two of your classmate's postings.
If possible, determine a 95% confidence interval for average number of television sets in all 50,000 households. If this is not possible, describe why not.
Assume you choose 20 houses at random. On average, how many houses of twenty would you expect to have DVD? Determine standard deviation of number of houses with DVD?
Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
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.
Regression equation Credits=15.4-.07. Select the correct statement. Increase in number of hours worked per week increases the expected number of credits.
Using the original data, estimate the population standard deviation with 90% probability.
Based on this sample information find out what percent of variation in starting salaries is described by GPA, and find out the equation that would forecast salary from GPA. Give a scatter plot.
Construct a 96 percent confidence interval for the mean weight of all firefighters six months after the exercise rooms were installed.
Would you conclude that your data set is approximately normal? If so, what percentage of your data values lie:
Assuming that the population standard deviations are the same, perform a two independent samples t-test on the hypotheses Null Hypothesis: μ1 = μ2, Alternative Hypothesis: μ1 ≠ μ2. What is the test statistic and p-value of this test?
A and B are two intersecting sets, and a, b, ab, and x represent the usual symbols for the number of elements contained in the four defined areas of the associated Venn Diagram. Find the values of ab and a if:
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