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A recent study of consumers ages 35-44, found that last year 56 out of 800 consumers had made a purchse using the internet; this year 180 out of 1200 plan to make a purchase using the internet. Test the claim that the proportion of consumers ages 35-44 who plan to make purchases using the internet has increased at α = 0.01.
Quality control engineer has been checking output by almost continuous sampling as abnormal condition began. Determine the probability that in sample of 10 pieces.
Let C be a circle enclosing the distinct points z1,z2,...zn. Let p(z)=(z-z1)(z-z2)...(z-zn) be the polynomial of degree n with roots at these points.
Construct a 95% confidence interval estimate for the population proportion of airline travelers who think that the airline fee that is most unreasonable is additional charges to redeem point/miles.
Describe the circumstances under which you should use ANOVA instead of t tests, and explain why t tests are inappropriate in these circumstances. Find a peer-reviewed article that reflects these circumstances, describe the research conducted (i.e...
What is the underlying variable that indirectly correlates these 2 variables? What other variables could you identify as having an indirect relationship?
Suppose 5.9% of certain population use public transportation to get to work. You randomly select 380 workers and ask them if they use public transportation to get to work.
For each of the F statistics given above find the degrees of freedom and an approximate P-value. Summarize the results of these tests.
A recent article in Business Week listed the "Best Small Companies." We are interested in the current results of the companies' sales and earnings.
What are the primary advantages and disadvantages of employing sampling in this application?
A sample of 100 widgets from the Acme production line shows that the average lifespan of these parts is 900 hours. The standard deviation of production has been 200 hours historically and is known to be normally distributed.
The following confidence interval is obtained for a population proportion, p:(0.458, 0.490). Use these confidence interval limits to find the point estimate, p-hat.
430 randomly selected light bulbs were tested in a laboratory, 224 lasted more than 500 hours. Find a point estimate of the proportion of all light bulbs that last more than 500 hours.
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