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Question: Several online textbook retailers advertise that they have lower prices than on-campus bookstores. However, an important factor is whether the Internet retailers actually have the textbooks that students need in stock. Students need to be able to get textbooks promptly at the beginning of the college term. If the book is not available, then a student would not be able to get the textbook at all, or might get a delayed delivery if the book is back ordered. A college newspaper reporter is investigating textbook availability at online retailers. He decides to investigate one textbook for each of the following seven subjects: calculus, biology, chemistry, physics, statistics, geology, and general engineering.
He consults textbook industry sales data and selects the most popular nationally used textbook in each of these subjects. He visits websites for a random sample of major online textbook sellers and looks up each of these seven textbooks to see if they are available in stock for quick delivery through these retailers. Based on his investigation, he writes an article in which he draws conclusions about the overall availability of all college textbooks through online textbook retailers. Write an analysis of his study that addresses the following issues: Is his sample representative of the population of all college textbooks? Explain why or why not. Describe some possible sources of bias in this study, and how it might affect the results of the study. Give some suggestions about what could be done to improve the study.
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How many integers are there between 5 and 14? How Many rational numbers are there between 5 and 14?
it is common practice in many countries to destroy shred refrigerators at the end of their useful lives. in this
According to USA Today, 65% of Americans are overweight or obese. If five Americans are chosen at random, what is the probability that at least one of them is overweight or obese?
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a statewide real estate agency old colony specializes in residential home sales in nothern pa. records indicate the
A health care professional wishes to estimate the birth weight of infants. How large a sample must she select if she desires to be 90% confident that the true mean is within 6 ounces of the sample mean?
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10701 Machine Learning - Spring 2012 - Final Examinations. Suppose you have a single neuron with a linear activation function g() as above and input x = x0, . . . , xn and weights W = W0, . . . , Wn. Write down the squared error function for this inp..
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The article "Birth Order and Political Success" (Psych. Reports, 1971: 1239-1242) reports that among 31 randomly selected candidates for political office who came from families with four children, 12 were firstborn, 11 were middle born, and 8 were..
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