Ch. 3 Problem 49

# Ch. 3 Problem 49 - 16-6 36 42 4 16 380 744 a S² = 744(10-1...

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Ch. 3, Problem 49, Pg. 81 Dave’s Automatic Door, referred to in Exercise 37, installs automatic garage door openers. Based on a sample, following are the times, in minutes, required to install 10 door openers: 28, 32, 24, 46, 44, 40, 54, 38, 32, and 42. a. Compute the sample variance. b. Determine the sample standard deviation. Openers (U) 28 -10 100 32 -6 36 24 -14 196 Mean: = Ū 38 46 8 64 44 6 36 40 2 4 54

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Unformatted text preview: 16 256 38 32-6 36 42 4 16 380 744 a) S² = 744/(10-1) S² = 82.67 b) s = Square Root (U - )²/n - 1 Σ Ū s = 9.09 (U - ) Ū (U - )² Ū Note: (U - ) = (U - Σ Ū Ū Mean: = U/n Ū Σ Sample Variance: S² = Sample Standard Devi S² = (U - ) Σ Ū ²/n - 1 s = Square Root 744²/(10-1) )² Ū = (U - )/n - 1 Σ Ū iation: s = Square Root (U - )²/n - 1 Σ Ū...
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## This note was uploaded on 11/18/2010 for the course QRB QRB 501 taught by Professor Conrad during the Spring '10 term at University of Phoenix.

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Ch. 3 Problem 49 - 16-6 36 42 4 16 380 744 a S² = 744(10-1...

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