Stats Sample Quizes

Stats Sample Quizes - Stat 119 Sample quiz, chapters 21 &...

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Stat 119 Name____________________________ Red id: __________________________ 1. You collect data and test the hypotheses 50 . 0 : 50 . 0 : 0 = p H p H a A P-value of 0.06 is obtained. Which of the following is true? A. A 99% confidence interval for p will not include the value 0.50. B. A 95% confidence interval for p will not include the value 0.50. C. A 90% confidence interval for p will not include the value 0.50. D. We cannot make a decision using the information given. Answer: 2. We calculate a 95% confidence interval for p to be (0.42, 0.58) and want to test the following: H o : p = 0.40 vs. H a : p 0.40. We can best conclude: A. Would not reject H o at α = 0.10. B. We would reject H o at α = 0.01. C. We would not reject H o at α = 0.05. D. We would reject H o at α = 0.10. Answer: 3. Public health officials believe that 90% of children have been vaccinated against measles. A random survey of medical records at many schools across the country found that among more than 13,000 children only 89.4% had been vaccinated. A statistician conducted a two sided hypothesis test and calculated a p-value of 0.011. Which of the following statements is correct? A. There is statistically significant evidence of a substantial change in the percent of children vaccinated. B. There is not statistically significant evidence of a change in the percent of children vaccinated. C. There is statistically significant evidence of a change in the percent of children vaccinated, and this outcome is also practically significant. D. There is statistically significant evidence of a change in the percent of children
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This note was uploaded on 05/04/2008 for the course STAT 119 taught by Professor Helen during the Spring '07 term at San Diego State.

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Stats Sample Quizes - Stat 119 Sample quiz, chapters 21 &...

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