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Find the critical value z that corresponds to the given confidence level of 90%. Use the sample data and confidence level to construct the confidence interval estimate of the population proportion p. n = 4500, x = 2925, 90% confidence.
Find the probability that a randomly selected employee earns less than $5.43.
what is the probability that at least 8 of the words on the test are words that the student knows?
Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10.
Calculate the population mean and population standard deviation.
The quality-control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of eight syringes taken from the batch. Assume the batch contains 1% defective syringes.
Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
The estimated salary range is $4,500, the margin of error should be $100 and the desired level of confidence is 95%.
Report descriptive statistics, assumptions tests, effect sizes (partial eta) as well as tests of statistical significance.
What would you recommend Taylor do to cut back its labor cost? (Illustrate using an ABC plan.)
What is the 95% confidence interval for the difference between the mean prices of the two models?
When the non-parametric statistics utilized? Write down an example.
What can one conclude about the librarian's hypothesis at a level of significance of .05?
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