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Home mortgage interest rates for 30-year fixed rate loans vary throughout the country. During the summer 2000, data available from various parts of the country suggested that the standard deviation of the interest rates was .096 (The Wall Street Journal, September 9, 2008). The corresponding variance in interest rates would be (.096) 2 = .009216. Consider a follow-up study in the summer of 2001. The interest rates for 30-year fixed rate loans at a sample of 20 lending institutions had a sample standard deviation of .114. Conduct a hypothesis test using Ho:o2=.009216 to see whether the sample data indicate that the variability in interest rates changed. Use a=.05. What is your conclusion?
Suppose that you have a bag filled with 50 marbles, 15 of which are green. What is the probability of choosing exactly 3 green marbles if a total of 10 marbles are selected?
Researcher asked group of 30 students - 12 of them supported change, 13 of them didn't, and 5 had no opinion. This is not binomial model as?
Determine the conditions under which you would use a discrete probability distribution rather than a continuous probability distribution. Provide one (1) example to illustrate your reasoning.
Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention.
The number of runs with respect to the sample median is:
Determine what analysis would you do on each problem (ie, one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
If the test is positive, what is the probability that this person actually has heart disease?
The number of false alarms a building fire alarm system registers has a Poisson distribution with a mean of 6 false alarms per year. The variance of the number of false alarms is what?
If an applicant is randomly selected, find the probability of a rating that is between 200 and 275.
Charmers' Candy Store sells wrapped hard candies in the following flavors: strawberry, blueberry, lemon, lime, and orange. They advertise that there are equal proportions of each flavor in every size of their candy boxes.
Three times each year, the procurement manager at Phoenix contacts National\'s marketing department to place a monthly order for each of the coming four months.
Assume that Los Arboles had a special program in place to encourage helmet use. Elucidate to what extent did removal of the outlier improve the fit.
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