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## E-Book Chapter Eight 8.50 Solutions

by: smartwriter Notetaker

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# E-Book Chapter Eight 8.50 Solutions

Marketplace > E Book Chapter Eight 8 50 Solutions
smartwriter Notetaker
CSU - Dominguez hills
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E-Book Chapter Eight 8.50 Solutions
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This 0 page Study Guide was uploaded by smartwriter Notetaker on Sunday November 15, 2015. The Study Guide belongs to a course at a university taught by a professor in Fall. Since its upload, it has received 22 views.

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Date Created: 11/15/15
850 Twenty ve blood samples were selected by taking every seventh blood sample from racks holding 187 blood samples from the morning draw at a medical center The white blood count WBC was measured using a Coulter Counter Model S The mean WBC was 8636 with a standard deviation of 39265 a Construct a 90 percent con dence interval for the true mean b Why might normality be an issue here c What sample size would be needed for an error of i 15 with 98 percent con dence Data are from a project by MBA student Wendy Blomquist A i make the con dence interval we need the standard deviation sample si ze mean observed 0 3 9265 n 187 xbar 8636 All the other info is of no use with a confidence interval 1 39265 l2 x187 xbar u xbar u i 39265 x187 This is the test statistic 3 here we can derive the confidence interval We will make a 90 confidence interval xbar p 1645 S S 1645 39265 V187 The limits on each end are gured out since the con dence level is 09 109 01 The limits are i zo39l i zoos 1645 xbar u 39265 V187 1645 S 1645 39265 3 xbar 1645 S S xbar 1645 V187 39u 3 xbar 1645 xbar1645 39265 187 187 xbar8636 2 2 L 8636 1645 86361645 3 9 65 187 1187 8636 0472335623 8636 0472335623 Z81636643779108335623 z 81649108 39265 V We are 90 con dent that the true mean WBC will fall roughly between 8164 and 9108 B Normality will be an issue here since the model is picking every 7th sample which is violating the normal sampling code of randomly chosen samples rather than systematic sampling C 0239265 n 187 xbar 8636 Margin of errorE 15 We want i have 98 con dence so on 1 098 002 002 Z 001 2 Z001 2326 according Z the table So we can calculate now NQ 2 Sample i N 0Z 2 E 39265x2326 2 15 3 9133039 2 15 2 60886926672 3 370721 z 38 Rounded to the nearest Whole number to get the full margin of error The sample 3 be 38

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