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Unformatted text preview: Stat 'Â§ 19 Name
Quiz SB Red id: Use the feilowing information for problems 12
Fourteen percent of people are leftâhanded. A random sample of ll persons is selected. l. {2 points) How many left handed people do you expect to ïŹnd 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 leftâhanded. 23 23 g: 3.... Master} %
t is t; is? t . st? rt s: 5% 5* 3W . Answer s a tt âi 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 ïŹxed number (n) of observations. The probability of success and the probability of failure must be equal. Use the following information to answer questions 45 ? ââ9" 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: *EZZsil ïŹniQïŹ 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  EfïŹe} 8. (3 points) Find the probability that the total. weekly income earned by the 90 workers exceed3$482$âŹ ' i? it ghee? as? ïŹg 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 4â77 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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 Spring '07
 Helen
 Statistics

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