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Determine the minimum required sample size if you want to be 99% confident that the sample mean is within 2 units of the population mean given sigma = 7.8. Assume the population is normally distributed.
A random sample of n = 16 scores is selected from a normal distribution with a mean of μ = 50 and standard deviation of σ = 10. a) What is the probability that the sample mean will have a value between 45 and 55?
The men took an average of 20.5 hours per year of personal time with a standard deviation of 2.75 hours. What is the pooled estimate of the variance? Round to three decimal places.
What assumption tests should be used? A fifth grade science teacher want to know if there is a relationship between final exam scores and overall course points after adjusting for a quiz score.
How many students should be surveyed if a 90% confidence interval is desired and the margin of error is to be only 3%?
Now assume institutional cache is used. Hit rate for cache is 0.6. Determine the total average response time.
How large should n be so that a 90% confidence interval for µ has a margin of error and What is the P-value for a test of the hypotheses
Findout the variance also standard deviation for the 2 distributions above. Evalute the variation of the data sets.
Appalachian Coal mining believes it can enhance labor productivity and therefore net revenue by reducing air pollution in its mines. It estimates that the marginal cost function for reducing pollution by installing additional capital equipment is.
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
The amounts dispensed by a cola machine follow the normal distribution with a mean of 7 ounces and a standard deviation of 0.10 ounces per cup.
Determine the probability that tire wears out before 70,000 miles?
Find the margin of error for the 95% confidence interval used to estimate the population proportion.
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