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Question: Identify each of the following studies as a survey, an experiment, an observational study, or a case study. Explain your reasoning.
a. A doctor claims to be able to cure migraine headaches. A researcher administers a questionnaire to each of the patients the doctor claims to have cured.
b. Patients who visit a clinic to help them stop smoking are given a choice of two treatments: undergoing hypnosis or applying nicotine patches. The percentages who quit are compared for the two methods.
c. A large company wants to compare two incentive plans for increasing sales. The company randomly assigns a number of its sales staff to receive each kind of incentive and compares the average change in sales of the employees under the two plans.
Population Variation = 84.4-0.13×diversity. How much of the variation is explained by diversity? How much of the variation is explained by diversity?
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
Mimi made a random guess at 10 true-or-false questions. Let event A be she got at least 6 correct answers. What is the complement of event A? Please explain your answer.
22% had both CD players and alarm systems. What is the probability one of these cars selected at random had neither a CD player nor an alarm system.
What sampling technique was used for the study - What was the level of measurement for each type of data collected in the study
Suppose that the service life in hours of a semiconductor is a random variable having a Weibull distribution with α = 0.025 and β = 0.500. (a) How long can such a semiconductor be expected to last?
A researcher wishes to test the claim that the average age of lifeguards in Ocean City is greater than 24 years. She selects a sample of 36 guards and finds the mean of the sample to be 24.7 years with a standard deviation of 2 years. Is there evi..
When Gallup asked the same question in 2001, only 45% of those respondents agreed. Is it reasonable to conclude that there was a change in public opinion given that the P-value is 0.37? Explain.
A study compared the effectiveness of several antidepressants by examining the experiments in which they had passed the FDA requirements.
(The Poisson distribution can be used to approximate the binomial distribution when n is large and p is small-say, p less than 0.1.
An investment counselor would like to meet with 12 of his clients on Monday, but he has time for only 8 appointments. How many different combinations of the clients could be considered for inclusion into his limited schedule for that day?
For decades, researchers, politicians, and tobacco company executives debated the relation between smoking and health problems, such as cancer.
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