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In February 8, 2002, Gallup Organization released results of poll concerning Americans attitudes toward 19th Winter Olympic Games in Salt Lake City, Utah. Poll results were based on telephone interviews with arbitarily chosen national sample of 1,011 adults, 18 years and older, conducted February 4-6, 2002.
Assume we wish to use poll's results to justify claim that more than 30 percent of Americans (18 years or older) say that figure skating is their favorite Winter Olympic event. Poll really found that 32% of respondents reported that figure skating was their favorite event. If, for sake of argument, we suppose that 30% of Americans (18 years or older) say figure skating is their favorite event (that is, P = .3), compute probability of observing sample proportion of .32 or more; that is P(p >.32).
Based on probability you calculated in part a, would you conclude that more than 30 percent of Americans (18 years or older) say that figure skating is their favorite Winter Olympic event?
What are the null and alternative hypothesis for this? What is a type II error in context of this test? Suppose that the researcher deceides not to reject the null hypothesis what sort of error might he be making?
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Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
A sample of 148 of our statistics students rated their level of admiration for Hilary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06 and the standard deviation was 1.70.
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What is the null and alternative hypothesis? What is your final conclusion?
A discrete probability is the likelihood that certain discrete data will occur. What is discrete data? Consider a scenario where you could use a discrete probability to predict the likelihood of an event.
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