Exam1solbdFall01

# Exam1solbdFall01 - Fall 2001 Exam 1 Solutions B No 1 D No 6...

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Fall 2001 Exam 1 Solutions MSCI3710 B No. D No. Solution Version B Version D 1 6 Test whether this company can be accused of paying lower wages, compared to the industry average, the correct set of hypothesis for this test is Ho:1 μ 14.50 Ha: μ < 14.50 B A 2 5 Hourly wages in a retailing industry are normally distributed with a mean of \$14.50 and a standard deviation of \$2.20. Z test is used when the population standard deviation is known regardless of sample size C B 3 7 Z = X- μ 1 1 13.3 – 14.5 = -3.45 σ √ n 2.2/ 40 C D 4 9 Z* = -1.00; Zcrit = -2.326 left tail (one-tailed) test; Z* > Zcrit; therefore, we fail to reject the null hypothesis. Conclude that there is insufficient evidence B A 5 8 left tail (one-tailed) test. Alpha = 0.05, Critical value = -1.645 B A 6 10 S p 2 = (n-1) S 1 2 + (n-1) S 2 2 = 23(1.34 2 ) + 17(1.55 2 ) = 2.0536 n 1 + n 2 – 2 40 C A 7 12 Alpha = .10; critical value = t 0.05, 40 =1.684 E E 8 11 t = X 1 - X 2 = 34.3 – 35.7 = -1.4 = -2.56 S p * 1/n

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## This note was uploaded on 03/09/2011 for the course DSC 3710 taught by Professor Staff during the Spring '09 term at North Texas.

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Exam1solbdFall01 - Fall 2001 Exam 1 Solutions B No 1 D No 6...

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