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A ball is picked at random from a box containing 3 white, 5 red, 8 blue, and 7 green balls. Find the probability of each event.
a. White ball is picked.
b. Blue ball is picked.
c. White or red ball is picked.
d. Green or white ball is picked.
e. Neither red nor green ball is picked.
f. Red or white or blue ball is picked.
Find the test statistic and do the two-sample test for equality of proportions. Is the decision close?
a. If n=8 for both samples, find each of the sample variances, and calculate the pooled variance. Because the samples are the same size, you should find that the pooled variance is exactly halfway between the two sample variances.
The mean sales per customer µ for all of the sales for your company last month is not known. Based on your past experience, you are willing to assume that the population standard deviation of sales, σ, is about $220. If you take a random sample of 10..
A major dvd rental chain is considering opening a new store in an area that currently does not have any such stores. The chain will open if there is evidence that more than 5,000 of the 20,000 households in the area are equipped with dvd playe..
Distribution of scores for Physical Functioning in women is normal, where are 99% of the women's scores around the mean in this distribution? Round your answer to two decimal places.
The authors of the assigned article, "A Patient-Driven Adaptive Prediction Technique to Improve Personalized Risk Estimation for Clinical Decision Support (http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3392846/) have found that using patient-driven, ad..
A marketing analyst in a large grocery store chain
3. Mr. Freude Lazer, a statistics professor at the University of IMAX, drives from his home to the university every weekday. He has three options to drive there: he can take the Beltway, or he can take a main highway with some traffic lights, or he c..
Water specimens contain nitrates, a solution that is dropped into the water will cause the specimen to turn red 95% of the time. When used on water specimens without nitrates, the solution turns the water red 10% of the time. Past experience in the l..
Firebrick Tire Company wants to increase sales of its long running, low-end Roadmaster Tire brand with anew advertising campaign promoting they will last at least 28,000 miles [Mu=28,000 miles]. Tests with arandom sample [n=30 tires] show a sample m..
A manufacturer creates widgets whose mass has mean 5 and standard deviation sigma. Ten widgets are shipped, and the shipment will be rejected if any of the widgets has mass = 7. Give the largest value sigma can be such that the probability of reject..
Let X1, X2 be two random variables with joint pdf f(x1, x2)=4x1x2, 0
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