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Question 1:
When a researcher has two samples with two means, one of the assumptions for two samples is independence of between the two samples. What does this mean? What happens if the independence assumption is violated?
Question 2:
What are the differences among a proportion, a percentage, and a ratio? When would a researcher use a hypothesis test for the difference in two population proportions? Explain.
suppose that in the setting of the previous exercise you are willing to settle for a margin of error of $1000. will the required sample size be larger or smaller?
as part of the national health and nutrition examination survey hemoglobin levels were checked for a sample of 1139 men
How many more observations are necessary for the efficiency expert to be 95% sure that the point estimate x¯ will be in error from the true mean p by at most 15 seconds and find a 75% confidence interval for the population mean number of cars per su..
Albert Einstein stated, "The formulation of a problem is far more often essential than its solution, which may be merely a matter of mathematical or experimental skill.
during ejection from a military airplane the pilots acceleration must not exceed 16g ig injury is to be avoided.
I believe this can be done by plotting out every 3 years average number of people working past 65 since 1997 until now and then making a predictability study as to number of people who will be working over the age of 65 in 2012.
Assume the least squares equation is Y' = 10 + 20X. What does the value of 10 in the equation indicate?
in a sample of discharge of suspended solids from a phosphate mine it was noted that the mean daily discharge was 27
In the opinion survey illustration used to open this chapter, out of 100 students surveyed by the opinion pollster, 75 indicated a preference for closed-book exams. If one considers the sampling of each student to constitute a Bernoulli trial in w..
Diehard Sneakers' quality control team analyzes how often their product is returned because of defects. What kind of assessment is this?
How to Find Expected Mean
At the 0.05 level of significance, is there evidence of a difference in the daily customer count based on the price of a small coffee?
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