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Based on a survey of 4113 U.S. adults, researchers at Stanford University concluded that Internet use leads to increased social isolation. The survey was conducted by an Internet-based polling company that selected its samples from a pool of 35,000 potential respondents, all of whom had been given free Internet access and WebTV hardware in exchange for agreeing to regularly participate in surveys conducted by the polling company. Two criticisms of this study were expressed in an article that appeared in the San Luis Obispo Tribune (February 28, 2000). The ?rst criticism was that increased social isolation was measured by asking respondents if they were talking less to family and friends on the phone. The second criticism was that the sample was selected only from a group that was induced to participate by the offer of free Internet service, yet the results were generalized to all U.S. adults. For each criticism, indicate what type of bias is being described and why it might make you question the conclusion drawn by the researchers.
A rollercoasters auditors estimate that the average daily. A Rollercoaster''s auditors estimate that the average daily loss from those illegally riding without tickets is at least(greater or equal) $295
the random variable x represents the number of cars per household in a town of 1000 households. find the probability of
a zoo has offers to look over cost of a new lion den. the actual cost y at 200000 is predicted by the pdffx x for 0
Determine the amplitude of the secondary field of the subsurface conductor and the amplitude of its real and imaginary components. What do the obtained results reveal about the nature of the conductor?
Does lovastatin reduce the risk of heart attack? Researchers gave lovastatin to 2,325 people and an placebo to 2,081 people. the average age of both groups in 58 years.
If she leaves the house on the market for another month, what is the mathematical expression for the probability density function of the sales price?
three cards are randomly selected without replacement from a standard deck of 52 playing cards. compute the conditional
Why do Type I and Type II errors exist in hypothesis testing? Do you see some similarities in hypothesis testing and the guilty or not-guilty decisions jurors must reach during trials? Explain.
American youngsters aged 6 to 19, 15% were seriously overweight. Calculate and interpret a confidence interval using a 99% confience level for the proportion of all american youngsters.
paleomagnetic studies of canadian volcanic rock known as the carmacks group have recently been completed. the studies
the weight of a bag of corn chips is normally distributed with a mean of 22 ounces and a standard deviation of
At the 5% level of significance, can we infer that the population mean weight of athletic men is lower than the population mean weight of non-athletic men by more than 2 pounds?
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