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Selecting the appropriate control chart and limits. At the present time, about 6 out of every 1000 lots of material arriving at a plant site from outside vendors are rejected because they do not meet specifications. The plant receives about 350 lots per week.
As part of an effort to reduce errors in the system of placing and filling orders, you will monitor the proportion of rejected lots each week. What type of control chart will you use? What are the initial center line and control limits?
the inside diameter of a randomly selected piston ring is a random variable with mean value 12 cm and standard
Smokers don't live as long (on the average) as nonsmokers, and heavy smokers don't live as long as light smokers. You regress the age at death of a group of male smokers on the number of packs per day they smoked. The slope of your regression line
Sweetwater & Associates write weekend trip insurance at a very nominal charge. Records show that the probability that a motorist will have an accident during the weekend and file a claim is 0.0005. Suppose they wrote 400 policies for the coming we..
1. What was the myth and what was the reality of the new professional woman of the 1920s? 2. Who opposed U.S. involvement in World War I and why?
Test the financial analyst's belief that the average rate charged by credit cards with monthly fees is less than 14%. Use a 5% significance level.
a computer system allows user ids that are three four or five characters long. repeated characters are allowed. the
a cracker bakery wants to test microwaving crackers after breaking to reduce the risk of broken crackers at the time
Seventy new jobs are opening up at an automobile manufacturing plant
Assume that the plane can make a safe landing if at least two of its engines are functioning correctly. What is the probability that the engines will allow for a safe landing?
Also compute a 95% confidence limit for the difference in the two proportions. Contrast what statements can be made from the test and the confidence limits.
e-loan an online lending service recently offered 36 month auto loans at 3.6 to applicants with good credit ratings. if
A random sample of printed pages from an office printer was obtained, and the page coverage was carefully measured. Is there any evidence to suggest the data are from a non-normal population?
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