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You are curious about whether the professors and students at your school are of different political persuasions, so you take a sample of 20 professors and 20 students drawn randomly from each population. You find that 10 professors say they are conservative, and 6 students say they are conservative. Is this a statistically significant difference? Write the two statistical hypothesis and conduct the appropriate test with your conclusion justified.
Create the 90% confidence interval for mean score of all such subjects. You may suppose scores are usually distributed.
A research team conducted a study of soft-drink preferences among residents in a test market prior to an advertising campaign for a new cola product.
A baseball player hits 59 home runs during a season with 161 games. What is the empirical probability that the player would hit at least one home run during any given game of the season?
Pollsters try to determine whether or not a person is a "likely voter" before they count their opinion in a poll. If we assume 40% of the registered voters will actually vote, in a random sample of 100 registered voters we can be 95% confident tha..
A manufacturer wishes to estimate the proportion of washing machines leaving the factory that is defective. How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?
Consider the formula used for any confidence interval and the elements included in that formula. What happens to the confidence interval if you (a) increase the confidence level, (b) increase the sample size, or (c) increase the original sample st..
Find the calcium level that is the borderline between low calcium levels and those not considered low. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
The χ 2 statistic from a contingency table with 6 rows and five columns will have:
Assuming that both patients are on time, find the expected amount of time that the 1:30 appointment spends in the doctor's office.
The prices (in dollars) for a sample of roundtrip flights from Chicago, Illinois to Cancun, Mexico are listed. Find the mean, median, mode, range, Q1, Q2, variance, and standard deviation of the flight prices.
What is the difference between the R and R-squared terms? What does each tell you? How large should the R-squared term be if you want to show that the two variables are practically related?
How can standardized z-scores be used to compare people across different contexts, such as the batting averages of two players -one who played in the 1970s and one who played in the 1990s?
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