8. The folloseng dats were collected by at intern worileg at the Male Mell say resort regardiey the efficiency of the Vis Foed enrine that was esed as power leme noye low for the banty slope. Masajen woda hie vo how tos amaey besen ef wervace dicy cad etpeti to actieve oet of thait deviosily faling at pae oel af a bypical 16h the capine will be able to rus for h+ befa lis-ades. 9. Dobi foom an 1h werk anpling staty we show beloc 1. What fercentege of the tithe in the duktine rasat? h. What fercentage of the lime is the miah ine hy lent 5. What is the limil of acurary of this stuty fxr a - nest 4. What it the 95 petcete coefielence interyal of the dedise danider? e. Voer manager syys that the nave in pan d is anaceppaby lurpe she would vatiote sheuld yoe collest in actirve this? GMaptith t4 10. Dertee Ce pronides a to perceer allowince ficr issapentors. A work sumpling 1. What is the oherned time fis minato for kading? h. Wat is the arrmal tirte for anlendingt c. What is the ovenll standed timet 4. byat is the accurasy def ife ilasyt 11. A wock sumpline inalyst mokes thut aut of SJ abernaksne x werker is taking a break 2 times, is chathng is a cownler 1 ding, and ts absete foun the borlivesion ance. The atafyst is 95 peruent onelflent bug the worket is arkally worling foom pefcent bo pelceat of der the, if de katement is ctangeat sarrgling stady? 1. How maty mitales of a rypical s-s wan duy is the Zip vperater woting? b. What is the aucngr pertirminoe of the Ig ogerablt 4. What is the arrmal tine fir the Zis ipernart a. What is the sicaue ine this seafy? 9. Data froen an 8-h work sampling study are shown below. a. What percentage of the time is the machine runaing? b. What percentage of the time is the machine brokea? c. What is the limit of accuracy of this stedy for a =0.05 ? d. What is the 95 percent confidence interval of the machine running? e. Your manager says that the range in part d is unacceptably large, She would like to narros the range doun to \pm 1 min of running time. How many observations should you collect to achieve this? CHAPTER 14 10. Dorben Co. provides a 10 percent allowance for its operators, A work sampling study of one operator over an 8-h shift yields the following data. Average rated perfocmance is 110 percent. Expected outpet is $0 unitsshift. a. What is the observed lime (in miestes) for loading? b. What is the normal time for unlcading? c. What is the averall standard time? d. What is the accuracy of the stady? 11. A work sampling analyst notices that our of 50 observations, a worker is taking a break 2 times, is charting to a coworker 2 times, and is absent from the workstation once. The analyst is 95 percent coefident that the worker is actually working from percent to percent of the time. If the statement is changed to say that the analyst is 95 pereent confidees that the worker is working from 87 percent to 93 percent of the time, what champes have occurred in the work stmpling study? 12. The following obeervations were obbained randomly over an 8-hour time perind on the Zip operator, during wtich time he assembled 20 Zip drives. a. How many minutes of a typical 8-h work day is the zip operator working? b. What is the average performance of the Zip cperator? c. What is the nocmal time for the Zip operator? d. What is the oferor for this study