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An environmental group is suing a manufacturer because chemicals dumped into a nearby river may be harming fish. A sample of fish from upstream (no chemicals) is compared with a sample from downstream (chemicals), and a 95% confidence interval for the difference in proportions of healthy fish is 0.01 to 0.11 (with a higher proportion of healthy fish upstream).
First, interpret this interval. The statistician for the manufacturer produces a 99% confidence interval ranging from -0.01 to +0.13 and tells the judge that because it includes 0 and because it has higher accompanying confidence than the other interval, we can't conclude that there is a problem. Comment on the statistician's conclusion.
Graph the given data.- Calculate appropriate summary statistics.- Write a few sentences about these data. (Remember: shape, center, spread, unusual features.)
Indicators of a maternal diagnosis of toxemia during the pregnancy, a condition characterized by high blood pressure and other potential complications, are saved under the variable name tox (1: toxemia; 0: no Toxemia).
q1. out of a total of 120 musicians in a club 5 can play all the three instruments- guitar violin and flute. it so
hamada equation cyclone software co. is trying to establish its optimal capital structure. its current capital
at year-end 2013 wallace landscapings total assets were 2.17 million and its accounts payable were 560000. sales
the mean weight of loads of rock is 50.0 tons with a standard deviation of 12.0 tons. if 16 loads are chosen at random
If they remain at the machine long enough to observe 32 feet of aluminum being produced, what is the probability that they will have left the area before the next defect occurs?
question the annual commissions earned by sales representatives of machine products inc. a manufacturer of light
several statistical tests have a way to measure effect size. what is this and when might you want to use it in looking
The citizens of a certain community were asked to choose their favorite pet.
a how large a sample should be taken if the population mean is to be estimated with 95 confidence to within 66? the
What type of error has possibly been committed? Explain the error in ordinary language.
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