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Suppose that the weights of cinder blocks at a local construction yard follow a normal distribution with mean of 20 kg and a variance of 0.25 kg2.
(a) What is the probability that a cinder block weighs at most 20.6 kg?
(b) What is the probability that a cinder block weighs more than 19.8 kg?
(c) What is the probability that a cinder block weighs between 19.9 and 20.2 kg?
(d) Find the weight, wU, that will be exceeded by 5% of cinder blocks.
(e) Find the weight, wL, that will be exceeded by 99% of cinder blocks.
Clearly identify the independent and dependent variables you would study. Determine whether a one-tail or two-tail test is most appropriate and explain why. Generate a testable null statistical hypothesis and an alternative statistical hypothesis.
Suppose you are planning a sample of employees to determine the monthly average # of vacation days. Standards set: Confidence level of 99% and an error of less than 5 units. Standard deviation be 6 units. What would be the required sample size?
Lengths had a calculated sample standard deviation of 8 and mean of 9.4. Select the 95% confidence for the true variance of the product lengths. Use the appropriate table in the book.
The width of a confidence interval is equal to twice the value of the margin of error. Explain your answer. What is the first step in hypothesis testing?
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the following sample was obtained from a population with unknown parameters.scores 6 12 0 3 4a. compute the sample mean
If the value of the standard normal random variable Z is positive, then the original score is where in relationship to the mean?
Finding appropriate z- and t-scores is important when constructing confidence intervals. Confidence intervals allow one to estimate important population parameters such as population mean, population proportion, population standard deviation, etc.
A researcher wishes to try three different techniques to lower the blood pressure of individuals with high blood pressure. The subjects are randomly selected and assigned to three groups
steel rods are manufactored with a mean length of 26 centimetercm. because of variability in the manufactoring process
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