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A population has a mean (m) of 30 and a standard deviation (s) of 6. Assume that a sampling distribution of sample means has been constructed, based on repeated samples of n = 225 from this population.
a. What would be the value of the mean of the sampling distribution?
b. What would be the value of the standard error of the mean?
Construct and interpret a 95% prediction interval fo the proceeds when the number of issues is 578.
If you randomly assign participants to groups, can you suppose the groups are equivalent at the beginning of the study?
what is the method to prove a cumulative distribution function of frechet distribution?complete
for each pair of values state the decision that will occur and state whyp-value 0.014 a 0.02p-value 0.118 a
Calculate table T t . Calculate Computed T c .
Customers arrive at a fast-food restaurant with one server according to a Poisson process at a mean rate of 30 per hour. The server has just resigned, and the two candidates for the replacement are X (fast but expensive) and Y (slow but inexpensiv..
two towns both have a mean income for their residents of 30000. the standard deviation of incomes of residents in
If the test had been two-tail (i.e., 2000 versus ) instead of right-tail, would the p-value still be 0.012? If not, what would the p-value be? Explain.
a sample of alzheimers patients is tested to assess the amount of time in stage iv sleep. the number of minutes spent
we have two urns where urn-1 contains 3 blue balls and 1 red ball while urn-2 contains 2 blue balls and 2 red balls.
A recent article in the Wall Street Journal reported that the 30-year mortgage rate is now less than 6 percent. A sample of eight small banks in the Midwest revealed the following 30- year rates (in percent):
Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using z test to test differences between two means?
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