Determine the p bar, Std deviationp, UCL, and LCL based on the questionnaire results, using a confidence interval of 95.5 percent, which is two standard deviations. (Round your answers to 4 decimal places.) P Bar:  Standard Deviation:  UCL:  LCL:

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Author:WINSTON, Wayne L.
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Chapter2: Introduction To Spreadsheet Modeling
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  1. You are the newly appointed assistant administrator at a local hospital, and your first project is to investigate the quality of the patient meals put out by the food-service department. You conducted a 10-day survey by submitting a simple questionnaire to the 400 patients with each meal, asking that they simply check off that the meal was either satisfactory or unsatisfactory. For simplicity in this problem, assume that the response was 1,000 returned questionnaires from the 1,200 meals each day. The results are as follows:

 

NUMBER OF UNSATISFACTORY MEALS

SAMPLE SIZE

December 1

65

1,000

December 2

42

1,000

December 3

73

1,000

December 4

54

1,000

December 5

58

1,000

December 6

68

1,000

December 7

80

1,000

December 8

56

1,000

December 9

85

1,000

December 10

79

1,000

 

660

10,000

 
  1. a. Determine the p bar, Std deviationp, UCL, and LCL based on the questionnaire results, using a confidence interval of 95.5 percent, which is two standard deviations. (Round your answers to 4 decimal places.)
  2. P Bar: 
    Standard Deviation: 
    UCL: 
    LCL: 
  3. b. What comments can you make about the process?
    A) The process is in statistical control.
    B) The process is out of statistical control. 
  4. A or B: 
  5.  
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