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The Institute of Psychiatry at Kings College London found that dealing with "infomania" has a temporary, but significant derogatory effect on IQ (Discover, November 2005). Researchers divided volunteers into two groups. Each subject took an IQ test. One group had to check e-mail and respond to instant messages while taking the test, and the second group took the test without any distraction. The distracted group had an average score that was 10 points lower than the average for the control group. Explain why it is important that the researchers created the two experimental groups in this study by using random assignment.
There are many examples of data mining methods being applied to business problems. But data mining methods are not only applicable to business problems. You are to research and cite at least three non-business areas where data mining might be frui..
the average math sat score is 517 with a standard deviation 119. a particular high school claims that its student have
The lifetime of automobile tires of a certain brand are found to follow an exponential distribution with mean 30 (in thousands of miles). Find the probability that one of these tires will last
Hypothesis testing, or significance testing, is a method of testing a claim or hypothesis about a parameter in a population, using data measured in a sample.
A research firm reported that 15% of those surveyed stated their health as poor, 26% as good, 40% as very good, and 19% as excellent. A health professional in Chicago wanted to determine if people in Chicago had similar feelings toward their healt..
Also, the sample data appear to have a bell-shaped distribution. Construct the 95% confidence interval for the mean time spent on paperwork by all managers.
The values are the average number of eggs laid daily for each of 75 flies (25 in each group) over the first 14 days of their lives.
In each of the following situations, state whether or not the given assignment of probabilities to individual outcomes is legitimate, that is, satisfies the rules of probability. If not, give specific reasons for your answer.
christine wong has asked dave and mike to help her move into a new apartment on sunday morning. she has asked them both
Another question asked at the Web site is, "How do the ethical dilemmas in this research compare with the ethical issues raised by Stanley Milgram's obedience.
Directions: Consider a possible linear relationship between two variables that you would like to explore. Define the relationship of interest.
The Pareto distribution with parameter a > 0 has PDF f(x) = a/xa+1 for x 1 (and 0 otherwise). This distribution is often used in statistical modeling.
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