A bin contains 40 pills with a weight of 3.1 gm. each, 30 pills weighing 3.2 gms each and 10 pills weighing 3.3 gms each. The weight of an average pill is found from
Given the data below, what is the 90% confidence interval for the variance?
22, 23, 19, 17, 29, 25
When trying to find all possible causes of a problem, which of the following tools would be useful?
Ⅰ. Systematic troubleshooting and brainstorming.
Ⅱ. Fishbone diagrams and histograms.
Ⅲ. Checklists and scatter diagrams.
Ⅳ. Control charts and graphs.
The use of 100% inspection normally means