69) A quality control chart is used to monitor the customer wait time at a local call center. Sample means of five times are averaged and plotted over time. Over the last hundred sample means, no sample means were outside a control limit. The chart shows A) chance variation B) standard variation C) assignable variation D) total variation 70) A quality control chart is used to monitor the customer wait time at a local call center. Sample means of five times are averaged and plotted over time. The last five sample means show a trend of increasing sample means. The process is A) out of control B) in control C) improving D) showing chance variation 71) A quality control chart is used to monitor the customer wait time at a local call center. Sample means of five times are averaged and plotted over time. The last five sample means show a trend of decreasing sample means. The process is A) out of control B) in control C) improving D) showing chance variation 72) A quality control chart is used to monitor the customer wait time at a local call center. Sample means of five times are averaged and plotted over time. The last 50 sample means are randomly distributed between the upper and lower control limits. The process is A) out of control B) in control C) improving D) showing assignable variation 73) A large restaurant contracts with a local laundry to wash white napkins. The laundry returns the napkins in bundles of 100 napkins. The restaurant randomly samples 10 napkins to make sure that the napkins are clean with no stains or other defects. The restaurant is using a method called A) statistical process control B) fishbone analysis C) Pareto analysis D) acceptance sampling