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Reuters (June 24, 1997) reported on a study published in the Journal of the American Medical Association (1997, vol. 277, pp. 1940-1944) in which researchers recruited 276 volunteers (aged 18 to 55) and used nose drops to infect them with a cold virus. The volunteers were then quarantined and observed to see whether they came down with a cold or infection. They also answered questions about their social lives, including the number of different types of contacts they had (family, work, community, religious groups, and so on). Reuters reported that "those with one to three types of social contacts were 4.2 times as likely to come down with cold symptoms and signs of infection compared to those with six or more contacts."
a. Explain why this is an observational study, not a randomized experiment.
b. What were the explanatory and response variables of interest to the researchers?
c. The researchers in this study took an unusual step to help reduce the impact of confounding variables. Explain what they did and why it might have helped to reduce the impact of confounding variables.
assume that adults have iq scores that are normally distributed with a mean of 100 and a standarddeviation of 15 as on
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Identify the point estimate of the average number of available hotel rooms in this lesson from each sample. Construct and Interpret a 95% confidence level for the true mean number of available hotel rooms, based on the point estimate of each sampl..
So which of our two main political parties is more concerned with achieving broad happiness, and which party is more concerned with fulfilling selfishness?
use this calculation table for the chi-square test for goodness-of-fit to complete this
Find the probability of accepting a lot as a function of the actual fraction of defective chips.- Construct a graph showing the probability of lot acceptance for each of the lot defective fractions,
positive correlation between CEO salary and the Stock Price, and therefore, for the good sake of the company's stock value, his salary should be increased. Do you agree with his argument? Explain why or why not.
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