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The inside diameter of a randomly selected piston ring is a random variable with mean value 12 cm and standard deviation 0.02 cm.
If is the sample mean diameter for a random sample of n = 16 rings, where is the sampling distribution of centered?
Give answer to three decimal places. What is the standard deviation of the distribution of ?
Now suppose the sample size is n = 64 rings. Where is the sampling distribution of centered?
Give answer to four decimal places
Using the information from (c) above, what is the standard deviation of the distribution?
For which of the two random samples, the one from part (a) or the one from part (c), is more likely to be within 0.01 cm of 12 cm?
At the 0.01 level of significance, is there evidence to support the professor's claim?
Formulating null and alternative hypothesis to test the claim averaging about $5000.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Ms. Tina Stevens just purchased a new dress that cost $120. What is the probability she paid cash or check? (Round your answer to 3 decimal places.)
Utilize the given degree of confidence also sample data to construct a confidence interval for population proportion.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
According to US Census Bureau, 7.1% of all births to non-smoking mothers are of low birth weight (
What is the best estimate of the average tread life in miles for the entire population of these tires?
a) Set up the null and alternative hypotheses, and perform the hypothesis test. b) Based on these results, does the diet appear to be effective? Does the diet appear to have practical significance?
The Starbucks in the Bauer College of Business found that 24% of customers purchase more than one cup of coffee per day from their shop. If 180 customers are randomly selected one day, what is the probability that no less than 25% of them purchase..
Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work so I can see how to do this for the future. This one is good example of what I can do in future for real estate.
A bond analyst is analyzing interest rates for corresponding municipal bonds issued by two different states. At α = .05, is there a difference in interest rates paid by two states?
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