Question

Control Charts: use the following for questions 36-40: Thad's Dry Cleaning is trying to Improve its image with its customers. Part of this program involves providing excellent customer service along with on time cleaning. A questionnaire accompanies each order asking the customer, among other things, whether they are satisfied or unsatisfied with the service. One hundred customers were sampled on each of the last seven days. The results are as follows Time Running Hide Attempts: A 16 at 11:59pm 1 Hour 17 Minutes, 53 Seco Samples Complaints 211 3 4 4 7 5 5 6 13 7 Total 61 (38) What is the estimate of the standard deviation of the sampling distribution of saluple proportions whenever this process is under control 0.107 0.020 0202 Previous

Answer 1

Pooled proportion = (12 + 11 + 4 + 7 + 5 + 13 + 9)/700 = 0.0871

Hence,

Standard deviation

$=\sqrt{\frac{0.0871*(1-0.0871)}{100}}$

= 0.0282

Option E is correct.