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"Crime Finds the Never Married" is the conclusion drawn in an article from USA Today (June 29, 2001). This conclusion is based on data from the Justice Department's National Crime Victimization Survey, which estimated the number of violent crimes per 1000 people, 12 years of age or older, to be 51 for the never married, 42 for the divorced or separated, 13 for married individuals, and 8 for the widowed. Does being single cause an increased risk of violent crime? Describe a potential confounding variable that illustrates why it is unreasonable to conclude that a change in marital status causes a change in crime risk.
a report states that 40 of home owners had a vegetable garden. how large a sample is needed to estimate the true
At the end of the training program, the attitude of each trainee was measured on a 100-pt. scale (the lower the score, the poorer the attitude). How many treatments are in this experiment?
A property of the least-squares regression line. Use the equation for the least-squares regression line to show that this line always passes through the point.
we have two urns where urn-1 contains 3 blue balls and 1 red ball while urn-2 contains 2 blue balls and 2 red balls.
Estimate, in millions of pounds, the amount of potato chips eaten during the game. Estimate the relationship of potato chips to popcorn. (twice as much, half as much, three times, none of these- pick one)
a large consumer goods company ran a television advertisement for one of its soap products. on the basis of a survey
A local school introduces a new academic program designed to improve students; grade point average (GPA) scores. To test the program, they select a sample.
Dick and Jane have agreed to meet for lunch between noon (0:00 p.m.) and 1:00 p.m. Denote Jane's arrival time by X, Dick's by Y, and suppose X and Y are independent with probability density functions fX(x)=3x2 for 0
In the recursive construction of decision trees, it sometimes happens that a mixed set of positive and negative examples remains at a leaf node.
People in a large population average 60 inches tall. You take a random sample and will be given a dollar for each person in your sample who is over 65 inches tall.
Suppose we wanted to conduct a survey. It is desired that we produce an interval estimate of the population mean that is ±5 from the true population mean.
In 1958, Russian poet and novelist Boris Pasternak was awarded the Nobel Prize for literature, but negative Soviet reaction forced him to refuse the honor. For which novel was Boris Pasternak awarded the Nobel Prize?
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