BSEC 10-25

# BSEC 10-25 - 39. Known that: 6. The population ={calorie...

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3 rd case A, o=0.10 Zo/z=1.645 case B, o=0.05 Zo/z=1.96 case C, o=0.01 Zo/z=2.575 318 38 46 41. Known that: 1. The population ={repair costs of all broken washing machines} The population mean U (i.e., the average repair cost of all broken machines) us unknown. 2. Sample size, n=40 Sample={x, x1, x2, x3, …} 3. Sample mean X_=\$120 4. sample standard deviation, s=\$17.50 (X1-x_)^2+(X2-x_)^2….(X40-x_)^2/40-1 5. Confidence level is 1-o=0.95 (95%), o=0.05 The 95% confidence interval for the unknown population mean U (the unknown average repair cost of all broken washing machines) is given by: 120+-(Z0.05/2)*17.5/sqrt40 120+-(1.96)17.5/6.225 120+-5.42 114.58, 125.42 we’re 95% confident that the unkown populaton U (the unknown average repair cost

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Unformatted text preview: 39. Known that: 6. The population ={calorie reading of all 8 oz servings} The population mean U (i.e., the average calorie reading of all 8 oz servings) us unknown. 7. Sample size, n=31 Sample={x, x1, x2, x3, } 8. Sample mean X_=99.3 9. sample standard deviation, s=41 (X1-x_)^2+(X2-x_)^2.(X40-x_)^2/40-1 10. Confidence level is 1-o=0.90 and 0.95 The 90% confidence interval for the unknown population mean U (the unknown average calorie reading of all 8 oz servings) is given by: 99.3+-(Z0.1/2)*41.5/sqrt31 99.3+-(1.645)41.5/5.567 99.3+-12.263 87.037, 111.563 were 90% confident that the unkown populaton U (the unknown average calorie reading of all 8 oz servings) lies betweem 87.037 & 111.563 38. 90% 21.99,24.41 95% 21.76, 24.64 46. 99% 97.79, 116.31...
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## This note was uploaded on 12/09/2010 for the course BUS 2313 taught by Professor Zhang during the Fall '10 term at East Central.

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BSEC 10-25 - 39. Known that: 6. The population ={calorie...

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