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: December 1 December 2 December 3 December 4 December 5 December 6 December 7 NUMBER OF UNSATISFACTORY MEALS 57 53 43 51 80 62 62 SAMPLE SIZE 1,000 1,000 1,000 1,000 1,000 1,000 1,000

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Operation management 

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:
December 1
December 2
December 3
December 4
December 5
December 6
December 7
December 8
December 9
December 10
ន
р
Sp
NUMBER OF
UNSATISFACTORY MEALS
a. Determine the p, Sp, 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.)
UCL
LCL
57
53
43
51
80
62
62
73
52
77
[s23)]
SAMPLE
SIZE
1,000
1,000
1,000
1,000
1,000
1,000
1,000
1,000
1,000
1,000
10,000
Transcribed Image Text: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: December 1 December 2 December 3 December 4 December 5 December 6 December 7 December 8 December 9 December 10 ន р Sp NUMBER OF UNSATISFACTORY MEALS a. Determine the p, Sp, 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.) UCL LCL 57 53 43 51 80 62 62 73 52 77 [s23)] SAMPLE SIZE 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 10,000
b. What comments can you make about the process?
O The process is out of statistical control.
O The process is in statistical control.
Transcribed Image Text:b. What comments can you make about the process? O The process is out of statistical control. O The process is in statistical control.
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