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Question: A retrospective study of 517 veterans who never smoked was done to determine whether there was an association between lung disease and exposure to workplace gases, dust, and fumes (Clawson, Stanford Report, November 1, 2000). In this study, subjects were asked whether or not they remembered being exposed to gases, dust, or fumes in the workplace. A concern expressed by the investigator was that "patients who have histories of lung diseases may be more likely to recall a history of exposure-whether accurate or not-than subjects reporting good health." Discuss whether each of the following is likely to be a problem in this study.
a. Relying on memory.
b. Confounding variable.
c. Hawthorne effect.
an accounting firm is planning for the next tax preparation season. from last years returns the firm collects a
The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes, with the following results:
Which combination of factors produces smallest risk of Type I error?
Determine if there is convincing evidence to support the claim that fewer than half of adult Americans can name at least one justice currently serving on the Supreme Court.
suppose that the distance from one end of a pole and the other be modeled by a normal distribution with mean 47.5 and
Two fair six-sided dice are tossed independently. Let X be value of first die, and Y value of second. Find out the expectations of following random variables.
company w is testing a sales software. their sales force of 500 people is divided into four regions northeast southeast
Suppose that you are managing the financial portfolio of a large municipality and must allocate all your investment between a domestic.
What is the probability that the project will be completed in 17 months or less?
a random sample of 130 human body temperatures provided by allen shoemaker in the journal of statistical education has
If Puck Chuck wanted to reset the machine so that only 17 in 1000 pucks would have velocities of less than 75 mph, what would the mean output of the machine be set to?
If Z = 1.96, s = 3, and E = 1, determine the correct sample size.
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