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Mortgage rates: Following are interest rates (annual percentage rates) for a 30-year fixed rate mortgage from a sample of lenders in Macon, Georgia on June 20, 2013. It is reasonable to assume that the population is approximately normal.
4.75 4.375 4.176 4.679 4.426 4.227 4.125 4.250 3.950 4.191 4.299 4.415
Construct a 99% confidence interval for the mean rate and interpret it.
One week earlier, the mean rate was 4.050%. A mortgage broker claims that the mean rate is now higher. Based on the confidence interval, is this a reasonable claim? Explain.
A study by Peter D. Hart Research Associates for the Nasdaq Stock Market revealed that 43% of all American adults are stockholders. In addition
In other words, both variables have the same mean but different standard deviations. Draw rough sketches of the two normal curves on the same graph.
a company decides to add a new program that prepares randomly selected sales personnel to increase their number of
the mean and the standard deviation of the sample of 100 bank customer waiting times in table 1.8 are xbar5.49 and
According to a 2004 report from the Centers for Disease Control, 5% of teenagers are gay or lesbian.
Assume that random variables X1,.....,X50 are independent and all have probability density function fX(x) = 1/x for 1
The accident probability at a new intersection is of interest to a traffic engineer. The engineer subjectively estimated the weekly accident probability.
Go through the conditions for which the sampling distribution of a sample proportion is approximately normal, and explain why they would apply to this situation.
Which do you think has a stronger relationship with value of the land-the number of acres of land or the number of rooms in the homes? Why?
What statistical procedure was used to analyze data in study B, how many groups were compared in study B, how many subjects were enrolled in Study C and which study demonstrated the greatest level of statistical significance?
create a 350- to 700- word summary of correlation as a measure of association including the following topics
What is regression output and how do you analyze and interpret adjusted R^2; coefficient estimates and their statistical significant?
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