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Accurate typesetting is crucial to the production of high-quality newspapers. The editor of the Morristown Daily Tribune, a weekly publication with circulation of 27,000, has instituted a process for monitoring the performance of typesetters. Each week 100 paragraphs of the paper are randomly sampled and read for accuracy. The number of paragraphs with errors is recorded in the table below for each of the last 30 weeks.
a. Construct a p-chart for the process
b. Is the process under statistical control? Explain.
c. Should the control limits of part a be used to monitor future process output? Explain.
d. Suggest two methods that could be used to facilitate the diagnosis of causes of process variation.
The following data represent survival time in days after a heart transplant and patient age in years at the time of transplant for 10 randomly selected patients.
1. a fruit grower sprays 200 trees with a new spray and 200 other trees with a standard spray to protect against insect
Is this statistically significant evidence that the candidate has enough valid signatures overall? Explain.
Determine the control limits for the mean and the range. Plot the control limits for the mean outside diameter and the range.
Joe is being audited by the IRS and must provide an estimate for his investment earnings over the next four years. After a thorough search, Joe can only find the following records.
cress electronic products manufactures components used in the automotive industry. cress purchases parts for use in its
Find the probability that every person who shows up for the flight will find a seat available - If a country has 100 nuclear plants, estimate the probability that there is at least one such accident during a given year.
Give an estimate of this common popualtion variance by pooling the sample variances given. Give an estimate of this common population variance based on the variance of the sample means given.
Compute SS, variance, and standard deviation for following population of N = 7.Scores: 8, 1, 4, 3, 5, 3, and 4. The definitional formula works well with these scores. Use the definitional formula to compute SS.
Develop a research question based on the variables in the data set - Formulate a null hypothesis and an alternative hypothesis.
boston public school district has had difficulty maintaining on-time bus service for its students a year later school
Construct a 90% confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of plus or minus .03 grams with a 90% confidence?
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