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QUESTION 1: A study used self-administered mail questionnaires to gather data on height and weight in order to calculate a measure of obesity. Which of the following types of problems were likely avoided by this method of data collection, and why?
QUESTION 2: A case-control study was performed to determine whether head injury was associated with an increased risk of brain tumors in children. 200 cases with brain cancer were identified from the state cancer registry and 200 controls were recruited from the same neighborhoods where the cases lived. The mothers of the children completed a questionnaire that asked them to describe their child's past history of head injury. The investigators found that the mothers of the children with brain tumors reported a past head injury for 70 of the cases while a past history of head injury was reported in 30 of the controls. What type of bias was likely to have influenced the findings of this study, and why? What can be done to minimize this type of bias?
QUESTION 3: Name four types of information bias. Name at least one way in which each type of bias can be prevented or minimized.
Is there a relationship between log (Wage) and Age? Compare your answer with graph (a) and identify the differences.
data on pull-off force pounds for connectors used in an automobile engine application are as follows 79.3 75.1 78.2
mcneese and klein 1991 looked at the average particle size. specifications give the standard deviation of 2 microns. a
The Boston Transit Authority wants to determine whether there is any need for changes in the frequency of service over certain bus routes.
chicago ohare and atlanta hartsfield-jackson are the two busiest airports in the unitedstates. the congestion often
Standard deviation of 8 hours. what percentage of the bulbs have lifetimes that lie within 1 standard deviation to either side of the mean?
For a hypothesis comparing two population means, what is the critical value for a one-tailed hypothesis test, using a 5% level of significance level, with both sample sizes equal to 13? Assume the population standard deviations are equal.
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
Show that the cla ratio for an ideal hexagonal close-packed structure is (8/3{'2 =1.633. If cla is significantly larger than this value, the crystal structure may be thought of as composed of planes of closely-packed atoms, the planes being lo..
Find the test statistic value for two mean tests in large sample.
Find out the estimate of the population mean.The mean daily sales at the Stop and Go are $20,000 for a sample of 40 days. The standard deviation of the sample is $3,000.
As an automobile moves along the road, the vertical displacements at the tires act as the motion excitation to the automobile suspension system [16]. Figure AP8.3 is a schematic diagram of a simplified automobile suspension system, for which we as..
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