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If -0.25 is a good estimation of population correlation, what sample size would be needed to achieve power of 0.80 at α=0.05?
Find the mean, the standard deviation, and the standard error of the mean. Is it appropriate to calculate a confidence interval based on these data? Explain why or why not.
A bag contains 5 red balls numbered 1, 2, 3, 4, 5 and 9 white balls numbered 6, 7, 8, 9, 10, 11, 12, 13, 14.
Using the experiment as a "pilot study", determine how many rats you should have in each group for a non-directional test. (The mean NE in the control group in example 7.9 is 444.2 ng/g and the SD is 69.6 ng/g.)
A consumer group surveyed food prices at 87 stores on the East Coast. Among the food prices being measured was that of sugar.
1. Identify the null hypothesis and the alternative hypothesis. 2. Determine the test statistic. Show all work; writing the correct test statistic, without supporting work, will receive no credit. 3. Determine the p-value. Show all work; writing th..
1.a psychology instructor asked the 100 females in her class to rate their intelligence on a scale of 1 to 10. the
(Birth and Death with Immigration) Consider a population of a certain colonizing species. Suppose that each individual produces offspring at a Poisson rate ?.
To answer the following questions, researchers would measure two variables for each individual unit in the study. In each case, specify the two variables.
Jointsoft is a great over-the-counter arthritis medication, but who will ever know about it? Unfortunately, many people with arthritis tend to be elderly and rather immobile, so advertisers of arthritis medications face limitations in ways to get ..
In study of a clinical for an allergy drug 115 of the 204 subjects reported experiencing important relief from their symptoms.
a standard deviation of 5 miles per gallon. At α=0.05, can you reject the auto maker's claim that the mean gas mileage of its luxury sedan is at least 25 miles per gallon?
x is a normally distributed random variable with a mean of 5.00. if the probability thatxis less than 6.32 is 0.67 as
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