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A report states that 57% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 3% with 95% confidence?
What is the probability that the next customer will request extra unleaded gas and fill the tank (A union B)?
The scatter diagram for data set below is shown. a) given that x= 3.667, sx = 2.5819889, sy= 1.5937377 and r= -0.8894261, find out least -regression line.
Determine whether a normal distribution or a t-distribution should be used or whether neither of these can be used to construct a confidence interval.
The serum cholesterol levels for men in one age group are normally distributed with a mean of 185.1 and a standard deviation of 37.8. All units are in mg/100 ml. Find the two levels that separate the top 8% and the bottom 8% of this population.
Find the evaluation score confidence intervals for the following two departments: Department 1 and Department 4 combined. Find the confidence interval at the 95% level. Use s = 6.06 and the mean 17.625.
The lives of many people are affected by a fear that prevents them from flying. The Marist Institute for Public Opinion conducted a poll of 1014 adults, 48%of whom were men.
Construct a 99% confidence interval for the true average amount of time customers spent in the restaurant. With a .99 probability, how large of a sample would have to be taken to provide a margin of error of 2.5 minutes or less?
A manufacturing process produces items whose weights are basically distributed. It is known that 22.57% of all the items produced, weigh between 100 grams up to the mean and 49.18% weigh from the mean up to 190 grams.
A psychology professor is interested in whether implementing weekly quizzes improves student learning. She decides to use the weekly quizzes in one section of her introductory psychology class and not to use them in another section of the same cou..
In a study of 24 criminals convicted of antitrust offenses, the average age was 55 years, with a standard deviation of 7.6 years. Construct a 98% confidence interval of the true mean age.
According to the Insurance Institute of America, a family of four spends between $400 and $3800 per year on all types of insurance. Suppose the money spent is uniformly distributed between these amounts.
The following survey questions have been established for a medical errors and patient safety business research paper:
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