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Let us suppose that the diameters at breast height (DBH)of a certain species of tree can be described by a Normalmodel with mean 239 mm and standard deviation 49 mm.
If 70% of the trees have diameters are between X and 350mm, what is X?
The following table presents data on political party affiliation and class level for sample of students in certain university: If the student is selected at random from sample, determine the probability that student is Republican.
Standard deviation of 0.7 inches. If 21 items is chosen at random, what is the probability that their mean length is less than 10.5 inches.
Discuss how a t Test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where using the t statistic may be an appropriate alternative to using a z-score.
If Stocks 1 and 2 have expected returns of 9 percent and 10 percent per year, respectively, then what is the minimum expected annual return for Stock 3 that will enable Glenda to achieve her investment requirement?
suppose we have a population of scores with a mean micro of 975 and a standard deviation s of 15. assume that the
Which would be inappropriate, and why. Then identify what you think is the best measure of variability to use for your example and explain why you believe it to be better than the others.
A sample of 64 observations is selected from a normal population. The sample mean is 215, and the sample standard deviation is 15. Conduct the following test of hypothesis using the .03 significance level.
Suppose that this is a simple random sample of adult residents of Maine.
microfracture knee surgery has a 75 chance of success on patients with degenerative knees. the surgery is performed on
a company that makes shampoo wants to test whether the average amount of shampoo per bottle is 16 ounces. the standard
Nine percent of undergraduate students carry credit card balances greater than $7000. Presume 10 undergraduate students are selected randomly to be interviewed about credit card usage.
What are the maximum and the minimum values in the entire set of data? List the actual values in the fourth row. List the actual values in the next to the last row.
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