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Schadek Silkscreen Printing, Inc. purchases plastic cups on which to print logos for sporting events, proms, birthdays, and other special occasions. Zack Schadek, the owner, received a large shipment this morning. To ensure the quality of the shipment, he selected a random sample of 300 cups. He found 15 to be defective.
a. What is the estimated proportion defective in the population?
b. Develop a 95% confidence interval for the proportion defective.
c. Zack has a an agreement with his supplier that he is to return lots that are 10% or more defective. Should he return this lot? Explain your decision.
Using the internal rate of return as a decision criterion, determine whether or not this proposal should be accepted.
a) 95% of confidence intervals generated will include the sample mean X. b) 5% of the confidence intervals generated will include the true mean μ
The ages of cars owned by all employees of a large company have a bell shaped distribution with a mean of 8 years and a standard deviation of 2 years. Using the empirical rule, find the approx. percentage of cars (owned by those employees) that are b..
Suppose that you select a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
Last week Sarah had exams in Math and in Spanish. On the math exam, the mean was m = 40 with s = 5, and Sarah had a score of X = 45. On the Spanish exam, the mean was m = 60 with s = 8 and Sarah had a score of X = 68. For which class should Sara e..
the probability that a household is both prosperous and educated is P (A and B) = 0.082. What is the probability P (A or B) that the household selected is either prosperous or educated.
Two different simple random samples are drawn from two different populations. The first sample consists of 20 people, with 10 having a common attribute.
An experiment was conducted to compare the effectiveness of three training programs, A, B, and C, in training assemblers of a piece of electronic equipment.
Calculate and interpret standard error of estimate se and coefficient of determination R2 for these data.
The following frequency table lists the sales of an item and the number of times it has occurred. It was obtained from historical records. Sales/Frequency: 10/100, 15/120, 20/300, 25/350, 30/400, 35/500, 40/300, 45/170.
What can we conclude from these figures at a level of significance of .01?
Two teams of workers assemble automobile engines at a manufacturing plant in Michigan. Quality control personnel inspect a random sample of the teams assemblies and judge
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