A manufacturer of dustless chalk instituted a quality control program to monitor chalk density. The sample...

A manufacturer of dustless chalk instituted a quality control program to monitor chalk density. The sample standard deviations of densities for 24 different subgroups, each consisting of n = 8 chalk specimens, were as follows:

This data has been coded so that you may copy and paste it into R with the name k.sdevs.

k.sdevs = c(0.203,	0.312,	0.098,	0.183,	0.227,	0.210,	0.323,	0.284,
0.146,	0.214,	0.053,	0.145,	0.272,	0.350,	0.158,	0.217,
0.387,	0.187,	0.147,	0.226,	0.278,	0.119,	0.091,	0.053)

mean(k.sdevs)

# Construct your own Control Chart.
LCL = 0.15 ##### change this value to be the same as your calculated LCL
UCL = 0.35 ##### change this value to be the same as your calculated UCL
plot(k.sdevs)
abline(h = mean(k.sdevs))
abline(h = LCL, lty = 2)
abline(h = UCL, lty = 2)

Calculate limits for an S chart. (Round your answers to four decimal places.)

s	=
a_n	=
LCL	=
UCL	=

Solutions

Expert Solution

orchestra answered 1 year ago

Next > < Previous

Related Solutions

QUESTION 9 As part of quality control, a pharmaceutical company tests a sample of manufacturer pills...

QUESTION 9 As part of quality control, a pharmaceutical company tests a sample of manufacturer pills to see the amount of active drug they contain is consistent with the labelled amount. That is, they are interested in testing the following hypotheses: H0:μ=100H0:μ=100 mg (the mean levels are as labelled) H1:μ≠100H1:μ≠100 mg (the mean levels are not as labelled) Assume that the population standard deviation of drug levels is 55 mg. For testing, they take a sample of 1010 pills randomly...

Density requirements of soils are critical to the QC/QA (quality control and quality assurance) of compacted...

Density requirements of soils are critical to the QC/QA (quality control and quality assurance) of compacted borrows in the construction of earth structures, like earth dams and highway embankments. a) How the density requirements can be established? b) Give different methods for the field density check and explain how each works.

A large firm made up of several companies has instituted a new quality-control inspection policy. Among...

A large firm made up of several companies has instituted a new quality-control inspection policy. Among 30 artisans sampled in Company A, only 5 objected to the new policy. Among 36 artisans sampled in Company B, 7 objected to the policy. a. Find the point estimate the true difference between the proportions voicing objection to the new policy for the two companies. b. Find the standard deviation of the point estimator in part a. c. Compute 95% confidence interval for...

How do you design a quality control program?

When identifying measures to monitor in a quality assurance performance improvement program(QAPI), the six domains of...

When identifying measures to monitor in a quality assurance performance improvement program(QAPI), the six domains of healthcare quality are used. List and briefly define four(4) of the domains of health care quality.

The quality control director for a clothing manufacturer wanted to study the effect of operators and...

The quality control director for a clothing manufacturer wanted to study the effect of operators and machines on the breaking strength (in pounds) of wool serge material. A batch of material was cut into square yard pieces and these were randomly assigned, two each, to all twelve combinations of four operators and three machines chosen specifically for the equipment. The results were as follows: Operator Machine I Machine II Machine III A 110 117 109 114 113 122 B 108...

design a Quality Control Program for your retirement finance management

A teacher instituted a new reading program at school. After 10 weeks in the program, it...

A teacher instituted a new reading program at school. After 10 weeks in the program, it was found that the mean reading speed of a random sample of 20 second grade students was 94.4 wpm. What might you conclude based on this result? Select the correct choice below and fill in the answer boxes within your choice. (Type integers or decimals rounded to four decimal places as needed.) A. A mean reading rate of 94.4 wpm is not unusual since...

Suppose that a control chart is used to monitor ? ̅ where the control limits are...

Suppose that a control chart is used to monitor ? ̅ where the control limits are set to 3?? ̅ and the warning limits are set to 2?? ̅. Answer the following: (a) If the false alarm cost per occurrence is $1000. What is the expected false alarm cost every 100 samples. (b) If the warning inspection cost is $100. What is the expected warning inspection cost every 100 samples. (c) Suppose the current sample size of 10 is quadrupled,...

2. You work in quality control for a manufacturer, and want to see what proportion of...

2. You work in quality control for a manufacturer, and want to see what proportion of your company’s products pass inspection. You take a sample of 80 products, and find that 65 of them pass inspection. a. What is your point estimate for the proportion that pass b. Use your answer from a) to find a 95% CI for ‘p’ (Remember, you are allowed to use the ‘short-cut’ formula here) c. You want your CI to be accurate to ±1.5...

Subjects