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Question: A major supplier of rocket motorswishes to control the number of nonconformities in a subassembly area producing fuel pumps. The inspection unit is defined as four pumps, and data from 16 samples (each of size 4) are shown in the Data File.
(a) Set up a u-control chart(average number) for nonconformities per unit.
(b) Do these data come from a controlled process? If not, assume that assignable causes can be found for all out-of-control points and calculate the revised control chart parameters.
(c) Suppose the inspection unit is redefined as eight pumps. Explain how you would determine a new sample size and revisions (if necessary) to the control limits for monitoring future productions.
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At the end of the course, the same test was given again. High scores mean lots of misconceptions. Analyze the data and write a conclusion about the effect of the course on misconceptions.
there are 5 men and 5 women and no 2 men or 2 women can sit next to each other
The probability will be .90 that the sample mean will not differ from the true mean by more than 20 percent of the std. deviation. How large a sample should he take?
In a random sample of 12 adults from the U.S., the mean waste recycled per person per day was 1.4 pounds with a sample standard deviation of .3 pounds. Assume that the distribution of x = waste recycled per person per day is normal.
Stat 11 Spring 2011 - Homework 1. A team of seven lightweight male rowers has an average weight of 158.2 pounds. The team plans to race in an eight-man boat, so another rower is needed. If the team needs to maintain an average (mean) weight below ..
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Find out the estimate of the population mean.The mean daily sales at the Stop and Go are $20,000 for a sample of 40 days. The standard deviation of the sample is $3,000.
A sample of 30 couples who have been married 10 years or less are selected from marital records available at a local courthouse. We are interested in the number of couples in this sample in which both spouses work. What is the probability that thi..
when determining the sample size needed to achieve a particular error estimate you need to know sigma. what are two
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