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A study undertaken by the Miami-Dade Supervisor of Elections in 2002 revealed that 44% of registered voters are Democrats, 37% are Republicans, and 19% are others. If two registered voters are selected at random, what is the probability exactly one voter is a democrat?
You find that a random sample of five microwave ovens has a mean repair cost of $75 and a standard deviation of $12.50. At α = 0.01, do you have enough evidence to support the repairer's claim?
Richard is one of test takers. Find out the number of questions he can expect to get right on test by random guessing.
For the past 20 years, the high temperature on April 15th has averaged (j = 62 degrees with a standard deviation of a = 8. Last year, the high temperature was 66 degrees.
Use a 0.05 significance level to test the claim of a cereal lobbyist that the mean for all cereals is less than 0.3g.
Create a 99 percent confidence interval for mean daily intake of milk. You may suppose daily intake amounts are usually distributed.
At 95% level of confidence, can we conclude that the babies using the Gibbs product gained less weight?
Testing for Population mean - Based on this sample evidence, is Joan's supervisor correct? Use a = .05.
Assume that increasing and decreasing allergic reactions are equally likely if the training has no effect. Use alpha = .05
Mauricio Cruz, a wine merchant for Cruz's Spirits Emporium, wants to determine if the average price of imported wine is less than the average price of domestic wine.
Assume the researcher's rats can be considered an SRS from the population of all laboratory rats. The mean Math SAT score of these students is found to be 560, 80 points higher than the national average.
Fitting of simple linear regression equation - Given the student population for a school district over the past few years, find the prediction equation for this data.
The airline must sell 150 seats to break even on this particular flight. On what percent of the flights does the airline make money?
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