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Q. Industry standards suggest that 13 percent of new vehicles require warranty service within the first year. Jones Nissan in Sumter, South Carolina, sold 9 Nissans yesterday. a. What is the probability that none of these vehicles requires warranty service? b. What is the probability...
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estimate the difference in mean travelling time to campus by taxi and bus by constructing a 90% confidence interval
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The shopping times were recorded for 64 randomly selected customers for a local supermarket. The average and variance of the 64 shopping times were 33 minutes and 256, respectively. Estimate the true average shopping time per customer, with a confidence coefficient of 1 = 0.90.
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In 1983, a random sample of 1000 scientists included 212 female scientists. A similar random sample of scientists in 1990 included 272 women. Do these fi gures indicate an increase in the population proportion of scientists who are women? Hint: Construct the 95% CI for the diff erence in...
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The manager of a grocery store wants to determine whether the amount of water contained in 1 gallon bottle purchased from a nationally known manufacturer actually average 1 gallon. It is known from the manufacturer's specifications that the standard deviation of the amount of water is equal...
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50 IQ scores ranging from 80 to 145 awhat is the mean?
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50 IQ scores ranging from 80 to 145 and accidentially typed in error as 415 what is the mean, median, standard deviation, and range?
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Drywall Permits Mortgage A Vacancy O Vacancy 328 49 8.35 2.98 13.43 376 79 8.08 5.6 14.51 373 79 7.9 2.25 14.24 144 50 7.69 4.26 14.3 194 37 7 2.6 11.64 220 53 7.32 2.97 10.61 126 22 8.4 5.35 18.45 301 69 8.28 3.13 18.52 54 21 8 5.6 10.29 252 46 8.95 4.81 11.91 381 79 8.21 5.88 17.75...
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The following data represent the running times of random samples of films produced by 2 motion-picture companies: Company Time (minutes) A 102 86 98 109 92 B 81 165 97 134 92 87 114 At the 1% level of significance, test the hypothesis that the average running time of films produced by...
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Eight pairs of data yield r = 0.708 and the regression equation y=55.8 + 2.79x Also, y= 71.125. What is the best predicted value of y for x = 6.8?
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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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