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The paper "Deception and Design: The Impact of Communication Technology on Lying Behavior" (ComputerHuman Interaction [2009]: 130-136) describes an investigation into whether lying is less common in face-to-face communication than in other forms of communication such as phone conversations or e-mail. Participants in this study were 30 students in an upper-division communications course at Cornell University who received course credit for participation. Participants were asked to record all of their social interactions for a week, making note of any lies told. Based on data from these records, the authors of the paper concluded that students lie more often in phone conversations than in face-to-face conversations and more often in face-to-face conversations than in e-mail. Discuss the limitations of this study, commenting on the way the sample was selected and potential sources of bias.
Suppose the psychologist actually observes y‾ = 6.2. Based on your answer to part a, make an inference about the population from which the sample was selected.
Refer to Exercise. The Roper Organization selected a random sample of adults in the United States for this poll. Suppose listeners to a late-night radio talk.
The figure shows the amount of money won by people playing blackjack and the amount of tips they gave to the dealer (who was a statistics student), in dollars.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of 6.0 emails per hour. Assume the arrival of these emails is approximated by the Poisson distribution.
Finding an X score. All Bright University will consider an applicant for its MBA program who scores 95 percent or higher on the GMAT exam. The mean and standard deviation, respectively, for this test are 578 and 94. What is the lowest score (X) th..
Formulate null and alternative hypotheses about the slope of the true regression line. State a two-sided alternative, and perform a significance test.
for a sample of 20 tires of a particular brand the average tread life was 65000 miles with a standard deviation of
A much larger sample would be needed to estimate the proportion of the U.S. Army's 2.4 million active duty and reserve personnel who approved the repeal than would be needed to estimate the proportion of the Marine Corp's 200,000 personnel who fel..
A patient is chosen at random from the clinic. What is the probability that the patient's test comes out positive for Lyme disease?
More people are using social media to network, rather than phone calls or e-mails (US News & World Report, October 20, 2010). From an employment perspective.
Let Yk denote the number of failures between successes k-1 and k of a Bernoulli(p)random process. Also, let Y1 denote the number of failures before the first success. What is the PMF PYk (y)? Is Yk an iid random sequence?
question 1a soft drink manufacturer is using a winning cap as a sales promotion. the purchaser can get a prize if they
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