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The article "Tots' TV-Watching May Spur Attention Problems" (San Luis Obispo Tribune, April 5, 2004) describes a study that appeared in the journal Pediatrics. In this study, researchers looked at records of 2500 children who were participating in a longterm health study. They found that 10% of these children had attention disorders at age 7 and that hours of television watched at age 1 and age 3 was associated with an increased risk of having an attention disorder at age 7.
a. Is the study described an observational study or an experiment?
b. Give an example of a potentially confounding variable that would make it unwise to draw the conclusion that hours of television watched at a young age is the cause of the increased risk of attention disorder.
in a random sample of five microwave ovens the mean repair was 80.00 and the standard deviation was 11.50. assume the
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The normal distribution is a theoretical distribution in which scores are symmetrically distributed above and below the mean, the median.
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A web based software company is interested in estimating the proportion of individuals who use the Firefox browser. In a sample of 200 of individuals, 33 users stated that they used Firefox. Using this data, construct a 99% confidence interval for..
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Calculate a table of expected counts for the data in given Exercise.- Show calculations verifying that the value of the chisquare statistic is 17.78.
The administration of a large university wants to use a random sample of students to measure student opinion of a new food service on campus.
a. Compute the mean quoted airfare. b. Compute the variance and standard deviation in airfares quoted. Treat the data as a sample.
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