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Question: Towers Perrin, a New York human resources consulting firm, conducted a survey of 1100 employees at medium sized and large companies to determine how dissatisfied employees were with their jobs (The Wall Street Journal, January 29, 2003). A total of 473 employees indicated they strongly...
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Suppose Abraham Lincoln answered a survey questionnaire and indicated that he had not received a grade school diploma. The researcher found that Abraham Lincoln s educational score did not correlate highly with the expected variable. What is wrong?
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On a day in August, the probability that it will rain in Richmond is 0.45 and the probability it will rain in New York city is 0.8. Assuming independence of rain in those cities, find the probability that it will rain; a.) In both cities b.)In neither city c.) Only in Moscow
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"A study has shown that the probability distribution of x, the number of customers in line (including the one being served, if any) at a checkout counter in a department store, is given by P (X=0) = 0.25, P(X=1) = 0.25, P(X=2) = 0.20, P(X=3)=0.20, and P(X_>4) =0.10. Considering a...
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Suppose that X and Y are correlated with r = 0.80. Does that mean that 80% of the data are clustered around the regression line?
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Use the binomial function to answer the following questions (there is no data set here): Suppose a shipment of 410 components contains 70 defective and 340 non-defective computer components. From the shipment you take a random sample of 20. When sampling with replacement (binomial), determine...
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A sample size of 900 is large enough to conclude that the sampling distribution of p is a normal distribution, when the estimate of the population proportion is .995.
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Describe the major phases of statistics
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how could I have a large sample that is not representative?
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- 1. A school administrator wonders if students whose first language is not English score differently on the math portion of the sat exam than students whose first language is English. The mean SAT math score of students whose first language is english is 516 on the basis of data obtained from the college board. A simple random sample of 20 students whose first language is not English result in a sample mean SAT math score of 522. SAT math score are normally distributed with a population standard deviation of 114. Why is it necessary for SAT math scores to be normally distributed to test the hypothesis?
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