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Test the claim that the samples come from population with the same mean. A consumer magazine wants to compare the lifetimes ofballpoint pens of three different types. The magazine takes arandom sample of the pens of each type and records thefollowing. Do the data indicate there is a difference in meanlifetime for the three brands? Use a level of 0.10. Brand 1: 260, 218, 184, 219, 190, 176 Brand 2: 181, 240, 162, 218, 225, 232, 241 Brand 3: 238, 257, 241, 213, 225
A population of scores has p = 44. In this population, an X value of 40 corresponds to z = - 0.50. What is the population standard deviation.
the cost of a college education has increased at a much faster rate than costs in general over the past twenty years.
The owner of a local night club has recently surveyed a random sample of n=250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30.
a biologist has found that 40 of all brown bears are infected with trichinosis. 10 brown bears are tested for
Construct a bar and pie chart to graphically display these data by using Microsoft excel.
From Data Set VI in Appendix B, select a sample of 20 values and find the 90% confidence interval or the mean of the number of acres. Find the mean of all values, and determine if the confidence interval contains the mean.
suppose that intrests rates offered for refinancing are normally distributed with a mean of 3.0 and standard deviation
In the case of Castenedav. Partida, it was found that during a period of 11 years in Hilda County, Texas, 870 people were selected for grand jury duty, and 39% of them were Americans of Mexican ancestry.
Use the binomial distribution in the Data Analysis add - in to simulate the distribution of men and women among the next ten arrivals at an emergency room, assuming that, on average, six people out of ten who arrive are men.
the director of an advertising agency is concerned with the effectiveness of a television commercial.what null
You are a research analyst with a large research and development firm, Akron Research. Your firm performs studies and analysis for companies that need product, process improvement, manufacturing, and consulting research services.
Class consists of 55% women, and 45% men 10% of the women smoke and 20% of the men smoke, what is the probability that a randomly selected smoker is female?
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