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In a certain population, body weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds. How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence that the error is no more than 1.5 percentage points.
Estimate the true proportion of college students who believe in the possibilty of haunted places with 99% confidence.
College Athletics: Graduation Rate. Women Athletes at the University of Colorado Boulder have a long term graduation rate of 67%. Over the past several years, a random sample of 38 women athletes at the school showed that 21 eventually graduated.
If in a random poll of 250 residents, 150 residents were in favor, how accurate is this result as an estimate of the proportion?
Three automobiles are selected at random, and each is categorized as having a diesel (S) or a nondiesel (F) engine (so outcome are SSS,SSF,ect.) If X= the number of cars among the three with diesel engines, list each outcome in S and its associate..
Assume that preparation D was a placebo. Use the Scheffe's procedure to compare the average response of A, B, C, and E to the response for D.
Explain in language that the manager can understand why we cannot be confident that sales rose by 6%, and that in fact sales may even have dropped.
a) Compute a 95% Confidence Interval for the true population proportion of successes. b) Based on this analysis can you conclude that the new system meets the requirement? Explain your conclusion.
Suppose in an attempt to develop marketing materials Tyco marketers are interested in determining whether there is a significant difference in the cost of replacing pipeline seals in different countries.
The data below show the average daily high temperature for Chicago, Illinois, for twelve recent spring and summer months. Construct a stem-and-leaf diagram for the data:
Let R be a principal ideal domain and let M be a torsion R-module. Prove that M is irreducible iff M=Rm for any nonzero element m in M where the annihilator of m is a nonzero prime ideal (p)
Explanation on what is the logic behind using the sum of the products of deviation scores as the numerator of the formula for the correlation coefficient?
A researcher conductued a study of the access speed of 35 hard drives and concluded that his maximum error of estimate was 35. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he ..
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