Question

1. Installing a muffler at Barut Garage, Inc. involves a five work tasks. Azra has timed workers performing these tasks seven times, with the results (in minutes) shown in the following table.
   

   No	Tasks	1	2	3	4	5	6	7	PR
   1	Select correct mufflers	6	4	3	4	5	4	4	100
   2	Remove old muffler	8	8	8	8	7	7	5	110
   3	Install new muffler	11	11	11	14	13	14	13	85
   4	Inspect the work	3	3	3	4	3	4	4	85
   5	Complete paperwork	8	8	8	10	8	8	8	100

   
     
         
   Given that Azra does not want an error of more than 0.08 and a confidence level less than 0.80 answer the following:
     
   Provide the z-score:  Round to the nearest hundredth, for example 4.22
     
   Does the number of observations for the following tasks warrant such confidence level?  
   Enter YES or NO.
     
   Task # 3 Install new muffler      :  
   Task # 5 Complete paperwork   :  
     
   What are the required numbers of observations for these tasks? Enter the number.
     
   Task # 3 Install new muffler      :  
   Task # 5 Complete paperwork   :  
     
   Assume that the number of observations for the following tasks justifies the confidence level and accuracy mentioned above. Also note that Azra factors in a total of fatigue and personal allowance of 0.10 applied to job time. Provide the following results from your solution:
   

   Task	Normal Time*	Standard Time*
   # 2 Remove old muffler	min	min
   # 4 Inspect the work	min	min

   
     
   Provide the total standard time* for the whole job:   minutes.
   *Round to the nearest hundredth, for example 8.45 minutes

20 points   

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Answer 1