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What's wrong? Each of the following statements contains a blunder. Explain in each case what is wrong.
(a) "There is a high correlation between the age of American workers and their occupation."
(b) "We found a high correlation (r = 1.19) between students' ratings of faculty teaching and ratings made by other faculty members."
(c) "The correlation between the gender of a group of students and the color of their cell phones was r = 0.23."
What is the 95.44 percent confidence interval for the estimated satisfaction level (8.5) in the benchmark survey? What is the 99.74 percent confidence interval?
The odds ratio between treatments (A, B) and outcome (death, survival) equals 2.0. What do you think about the following interpretation: "The probability of death with treatment A is twice that with treatment B". If you think, the above interpreta..
Researchers routinely choose an alpha level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower alpha level (e.g., 0.01)? What are some situations in which you might accept a higher level (e.g., 0.1)?
What is the base rate for lung cancer in men over a lifetime?- What is the approximate lifetime risk of getting lung cancer for men who smoke?
Chips ahoy. For the computer chips described in Exercise, how many do you expect to test before finding a bad one?
The length of certain bricks is a random variable with a mean of 8 inches and a standard deviation of 0.1 inch, and the thickness of the mortar between two bricks is a random variable with a mean of 0.5 inch and a standard deviation of 0.03 inch.
The goal of a study by Klinger et al. was to determine how symptom recognition and perception influence clinical presentation as a function of race. They characterized symptoms and care-seeking behavior in African-American patients with chest pain..
in a study in which k 3 n 21 mean of x1 45.3 mean of x2 16.9 and mean of x3 8.2 you compute the following sums of
When comparing data from different distributions, what is the benefit of transforming data from these distributions to conform to the standard distribution?
construct a 99 confidence interval estimate of the mean of the differences between volumes for the first born and the
Last week Sarah had exams in Math and in Spanish. On the math exam, the mean was m = 40 with s = 5, and Sarah had a score of X = 45. On the Spanish exam, the mean was m = 60 with s = 8 and Sarah had a score of X = 68. For which class should Sara e..
When the government gets involved, however, a group of bureaucrats is given the power to take our money and give it to the arts they wish to support.
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