quiz10-key -...

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Quiz 10. April 20, 2011 Seat # _________ Name: ___ < KEY > ___ Closed book and notes. No calculator. Recall: X d = Σ i = 1 n X i / n Recall: S 2 = [ Σ i = 1 n X i 2 nX d 2 ] / ( n 1) Consider a sample containing the data 14.2, 30.4, 8.1, 34.5, 8.7, 5.5. 1. (2 points) Determine the sample size. ____________________________________________________________ n = 6 ____________________________________________________________ 2. (2 points) Determine the value of the median. ____________________________________________________________ The order statistics are x (1) = 5.5, x (2) = 8.1, x (3) = 8.7, x (4) = 14.2, x (5) = 30.4, x (6) = 34.5. The two center values are x (3) and x (4) . Therefore the sample median is [ x (3) + x (4) ] / 2 = (8.7 + 14.2) / 2 = 11.45 ____________________________________________________________ 3. (2 point) Determine the value of the first order statistic. ____________________________________________________________ x (1) = 5.5 ____________________________________________________________ 4. (2 point) Determine the value of the sample mean. (No need to simplify.)
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Unformatted text preview: ____________________________________________________________ x d = [14.2 + 30.4 + 8.1 + 34.5 + 8.7 + 5.5] / 6 ____________________________________________________________ 5. (2 point) Determine the value of the sample standard deviation. (No need to simplify.) ____________________________________________________________ The sample standard deviation is S , the positive square root of S 2 = 6 1 [14.2 2 + 30.4 2 + 8.1 2 + 34.5 2 + 8.7 2 + 5.5 2 ] 6( x d 2 ) hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh ____________________________________________________________ ______________________________________________________________________ Write on the back any concerns about the weekly quizzes or the course in general. IE 230 Page 1 of 1 Schmeiser...
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This note was uploaded on 04/25/2011 for the course IE 230 taught by Professor Xangi during the Spring '08 term at Purdue University-West Lafayette.

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