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a. A statistics practitioner would like to estimate a population mean to within 50 units with 99% confidence given that the population standard deviation is 250. What sample size should be used?
b. Redo Part a changing the standard deviation to 50.
c. Redo Part a using a 95% confidence level.
d. Redo Part a wherein we wish to estimate the population mean to within 10 units.
The yield strength (ksi) for A36 steel is normally distributed with µ = 43 and s = 4.5. What strength value separates the strongest 10% from the others?
allante pizza delivers pizzas throughout its local market area at no charge to the customer. however customers often
For a normal random variable with mean 16.5 and standard deviation 0.8, find a point of the distribution such that there is a 0.85 probability that the value of the random variable will be above it.
Scatterplots. Which of the scatterplots at the top of the next column show-little or no association?
Q6: A global financial institution transfers a large data file every evening from offices around the world to its headquarters. The time required to process the file is normally distributed with mean of 1.5 hours and standard deviation of 15 minutes.
in a study of stability of iq scores a large group of individuals is tested one at age 18 and again at age 35. the
What events occurred in these months that may have caused such an extreme performance in the stock's return and describe and analyze the monthly returns using Stata's statistical and graphics capabilities.
Compute the sample variance and the sample standard deviation for these data (to 2 decimals).
suppose that you and a friend play a game with the following rules there is a green player and a blue player there are
Dick hits a bull's eye 90% of the time and sally hits a bull's eye 95% of the time. What is the probability that either one or both will hit the bull's eye if each takes one shot? What is the probability that dick ans sally will both hit the bu..
Find the probability that among the 10 offspring peas, at least 9 have green pods.
What is the test-retest method of estimating reliability? Describe the type of study that would be needed to find evidence of test-retest reliability. When is this method best used? When should it not be used?
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