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One environmental group did a study of recycling habits in a California community. It found that 74% of the aluminum cans sold in the area were recycled. (Round your answers to four decimal places.)
(a) If 397 cans are sold today, what is the probability that 300 or more will be recycled?
(b) Of the 397 cans sold, what is the probability that between 260 and 300 will be recycled?
If X=85 (sample mean), 8 is population standard deviation, and n=64 is sample size, construct a confidence interval estimate for the population mean.
Draw a scatter diagram. Based on the scatter diagram, does there appear to be any relationship between the number assemblers and production? Explain.
Shall we reject the hypothesis that the population mean is 6.0? Interpret the result.
Study have in distinguishing between case-fatality rates in 1990 and 2000-2005 if a two-sided test with significance level .05 is planned? B. How large a sample is needed in the previous problem to achieve 90% power?
Use the following graph of a function f to determine x or y to the nearest integer as indicated. Some problems may have more than one answer.
An experiment is designed to test the effectiveness of a specific type of gender selection process, using 15 couples trying to have baby girls.
Using the confidence interval method, test the claim that the average age of consumers is at least 30 years ( α= 0.05). Test the same claim by using the test statistics method ( Z or T test).
In performing the symmetric approximation, you calculate a mean of the total system cost as $1,725K. The variance is 22500. The POE is $1,600K.
assume z has a standard normal distribution. use appendix table ii to determine the value for z that solves each of the
The following data are from an independent-measures experiment comparing two treatment conditions. Do these data indicate a significant difference between the treatments
After an unusually dry atumn, a radio announcer ia heard to say, "Watch out! We'll pay for these sunny days later on this winter." Explain what he's trying to say, and comment on the validity of his reasoning.
Researchers wanted to determine if there is a difference in the mean credit card debt owed by males versus females. Using α = 0.10, is there a difference. (Show all six steps of hypothesis testing.)
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