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In a study designed to test the effectiveness of garlic for lowering cholesterol, 49 adults were treated with garlic tablets. Cholesterol levels were measured before and after the treatment. The changes in their LDL cholesterol (in mg/dL) have a mean of 3 and standard deviation of 14. Construct a 95% confidence interval estimate of the mean change in LDL cholesterol after the garlic tablet treatment. Show all work. Just the answer, without supporting work, will receive no credit.
Figure 19.2 shows track patterns of wolf packs, mapped in a census of a study region in the Gulkana River area of Alaska (Becker 1990). The number yk of wolves in each pack is given near each set of tracks.
Use Chebyshev's theorem to find what percent of the values will fall between 162 and 292 for a data set with a mean of 227 and standard deviation of 13.
In a survey on corporate ethics, a poll split a sample at random, asking 538 faculty and corporate re- cruiters the question: "Generally speaking, do you believe that MBAs are more or less aware of ethical issues in business today than five years ..
let z be a standard normal random variable. use the calculator provided to determine the value of c such that p-c lt z
Typographic errors in a text are either nonword errors (as when "the" is typed as "teh") or word errors that result in a real but incorrect word. Spell-checking software will catch nonword errors but not word errors. Human proofreaders catch 70% ..
How much should they charge for a 2 year extended warranty so that they will still make money selling the extended warranties in the long run and keep the cost of the warranties as low as possible to make them more marketable?
Define and mention characteristics of normal probablity curve, Distinguish a group of 500 people into three groups assuming that the attribute of grouping is normally distributed.
a. Find the degree of freedom for unequal variance test. b. State the decision rule for .05 significance level. c. Compute the value of the test statistic.
Outline the difference between the t test for independent groups and the t test for matched groups. A researcher computed the F ratio for a four-group experiment.The computed F is 4.86. The degrees of freedom are 3 for the numerator and 16 for the ..
In a random sample of 184 college students, 97 had part-time jobs. Find the margin of error for the 95% confidence interval used to estimate the population proportion.
hese students obtained a mean score of 470 with a standard deviation of 40 on a standardized test. Assuming a mound-shaped and symmetric distribution, what percentage of scores exceeded 390?
a certain city divides naturally into ten district neighborhoods. how might a real estate appraiser select a sample of
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