StatisticsQuiz1FinalVersion

StatisticsQuiz1FinalVersion - Spring2009 Statistics Quiz 1...

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Spring 2009 1 Statistics Quiz 1 1. A researcher determines that he needs results from at least 350 subjects to conduct a study. In order to compensate for low return rates, he mails a survey to 10,000 subjects and receives 391 responses. Is his sample of 391 responses a good sample? Explain you answer. 2. After constructing a relative frequency distribution summarizing IQ scores of college students, what should be the sum of the relative frequencies? If the percentages are used, the sum should be_____________. If proportions are used, the sum should be _______________. 3. The data represents the daily rainfall (in inches) for one month. 0.42 0 0 0.21 0 0.68 0 0.16 0 0 1.28 0 0.15 0 0.01 0 0.16 0 0.17 0.64 0 0.01 0 0.25 0 0.13 0 0 0.11 0 a.) Construct a frequency distribution beginning with a lower class limit of 0.00 and use a class width of 0.20. b.) Does the frequency distribution appear to be roughly a normal distribution? Why or why not? 4 Suppose we survey 250 people and ask them for the number of hours they spent using the internet during the past week.
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