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quiz%205B - Stat'Â 19 Name Quiz SB Red id Use the feilowing...

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Unformatted text preview: Stat 'Â§ 19 Name Quiz SB Red id: Use the feilowing information for problems 1-2 Fourteen percent of people are leftâhanded. A random sample of ll persons is selected. l. {2 points) How many left handed people do you expect to ïŹnd in the sample of El Persons? xi: E; 5Â§Â§Â§Â§E g: Esgkf 2. {2 points) Find the probability that at least two of the El. persons is leftâhanded. 23 23 g: 3.... Master} % t is t; is? t . st? rt s: 5% 5* 3W . Answer s a tt âi â ii 3. (1 point) Which of the foilowing is NOT a property of the binomial distribution? A. The observations or trials are independent. B. For each trial only two, mutually exclusive outcomes are possible. . There are a ïŹxed number (n) of observations. The probability of success and the probability of failure must be equal. Use the following information to answer questions 4-5 ? ââ9" Eggs? At a large computer company, 85% of all empioyees have a college degree. Suppose a rando sample of 390 employees is obtained and 81% of them have a coilege degree. a m k 4. (2 points) What are the mean and standard deviation of the a . seYt Aaswer: Meanm 0.81? Answer: *EZZs-il ïŹniQïŹ 6. (3 points) Suppose that 12% of all Americans ase CNN as their primary source of news. A random sample of 100 Americans is selected. What is the probability that between 7' and 20 peep in your sample of 100 Americans will use CNN as their primary news source? ïŹ X Q a @? Answer: Use the following to answer problems 740 For the population of farm workers in New Zealand, the weekly income has a distribution that is skewed to the right with a mean of \$560 and a standard deviation of \$140. A researcher decides to take a random sample of 90 workers. 7. (2 points) Describe the sampling distribution of the sample mean for the 90 workers Wee le is ten :39 Egg - EfïŹe} 8. (3 points) Find the probability that the total. weekly income earned by the 90 workers exceed3\$482\$âŹ ' i? it ghee? as? ïŹg ggggggĂ© a ?5% ? grggg gggg as Â§Â§tÂ§ 9. (2 points) What is the mean weekly income for the sample of 90 workers such that the percentage above this level 4â77 10. (i point) Suppose that a sample of 900 households had been selected, instead of 90. Which of the following statements is correct? The variability of the sample mean would be decreased, because It is larger. The variability of the sample mean would be increased, because n is larger. The variability of the sample mean would he unchanged; it does not depend on :3. There is not sufficient information given to know how the variability of the sample mean would be affected. B. C. 3:). Answer: ...
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quiz%205B - Stat'Â 19 Name Quiz SB Red id Use the feilowing...

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