A study published in the British Journal of Health Psychology (D. Wells, vol.12, 2007, pp. 145–156) found that dog owners are physically healthier than cat owners. The author of the study was quoted as saying, “It is possible that dogs can directly promote our well being by buffering us from stress. The ownership of a dog can also lead to increases in physical activity and facilitate the development of social contacts, which may enhance physiological and psychological human health in a more indirect manner.” Identify lurking variables in this explanation, and use this quote to explain how lurking variables can be responsible for an association.
Answer to relevant QuestionsThe variables y = annual income (thousands of dollars), x1 = number of years of education, and x2 = number of years experience in job are measured for all the employees having city-funded jobs in Knoxville, Tennessee. ...Let y = final exam score and x = midterm exam score. Suppose that the correlation is 0.70 and that the standard deviation is the same for each set of scores. a. Using part b of the previous exercise and the relation between ...Use the points from the previous exercise with x = 3, 5, 6, 7. a. Find the z -scores on x and on y for each point. Comment on how zx and zy relate to each other for each point. b. Compute r using the z -scores from part a ...Is there a relationship between how many sit-ups you can do and how fast you can run 40 yards? The EXCEL output shows the relationship between these variables for a study of female athletes to be discussed in Chapter 12. a. ...Each month, the owner of Fay’s Tanning Salon records in a data file y = monthly total sales receipts and x = amount spent that month on advertising, both in thousands of dollars. For the first three months of operation, ...
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