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7. A company believes its market share is about 18%. Find the minimum required sample size for estimating the actual market share to within 6% with 95% confidence. a. 23 b. 24 c. 25 d. Other:____________________(specified)
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Quality Progress, Feburary 2005, reports on the results achieved by Bank of American in improving customer satisfaction and customer loyalty by listening to the "voice of the customer". A key measure of customer satisfaction is the response on a scal from 1 to 10 to the...
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Histograms for grouped data Here are the shopping times (in minutes) for a sample of shoppers at a particular computer store: Draw the histogram for these data using an initial class boundary of , an ending class boundary of , and classes of equal width. Note that you can add or remove...
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If the amount of gasoline purchased per car at a large service station has a popilation mean of $15 and a population standard deviation of $4, then 99.73% of all cars will purchase between $3 and $27. True or false
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A restaurant claims that, in average, its service time for an order is 5 minutes. A research company wants to test this claims to see whether it is true. Using a random sample of 45 orders, the company finds that the average service time is 6 minutes and the standard deviation is 2.5 minutes. The...
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A multiple regression model is given below, with n = 20: y = 3.4 + 6.25x1 + 4.72x2 R2 = 0.935 sb1 = 2.74 sb2 = 2.4 17. The t-test statistic for x1 is: a. 2.604 b. 1.723 c. 2.281 d. Other:____________________(specified) 18. With alpha = 0.05, there is a relationship between x1 and...
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11. Company A wants to estimate the weekly sale of its product. Data of number of sales are collected in 20 weeks show that the average weekly number of sales is 600 and standard deviation is 50. Assume that the number of sale is normally distributed. The 99% confidence interval for the average...
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properties of T-dist'n and F-dist'n
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8.12 Determine the value of the confidence coefficient z( /2) for each situation described: a. 1 - = 0.90 b. 1 - = 0.95
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*4. Potential customers arrive at a single-server station in accordance with a Poisson process with rate . However, if the arrival nds n customers already in the station, then he will enter the system with probability n. Assuming an exponential service rate , set this up as a birth...
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