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The mean and standard deviation of the lifetime of a car muffler manufactured by company A are 5 and 2 years, respectively. These quantities for car mufflers manufactured by company B are, respectively, 4 years and 18 months. Brian buys one muffler from company A and one from company B. That of company A lasts 4 years and 3 months, and that of company B lasts 3 years and 9 months. Determine which of these mufflers has performed relatively better.
Let X1,..., Xn be a random sample recorded as heads or tails resulting from tossing a coin n times with unknown probability p of heads. Find the MLE pˆ of p. Also using the invariance property, obtain an MLE for q = 1 - p. How would you use the re..
if the level of confidence is increased while the sample size remains the same how will the width of a confidence
Suppose that you have 10 observations that have a mean of 7, a median of 6, and a standard deviation of 3. If you halve the value of each observation, what are the new values of the: Mean? Median? Standard deviation
Twenty one out of 100 randomly selected women said they use seat belts, while 117 out of 180 men said the same. Test the claim that men are more safety conscious than women based one the use of seat belts at a 0.01 level of significance. Construct..
Scores range from 0 to 200. The mean score for students who live on the west coast is about 115. Construct a 90% confidence interval for the unknown mean of the students on the east coast.
An article that appeared in USA Today (September 3, 2003) included a graph similar to the one shown here summarizing responses from polls conducted
Determine whether the following definitions are stipulative, lexical, precising, theoretical, or persuasive.- "Ramster" means an animal produced by crossbreeding a rat with a hamster.
Salary information for a random sample of male and female employees of a large company is shown below.
However, argue why this isn't really fair to you, that is, argue why your expected winnings are negative.
Networked computers tend to slow down when they are overloaded. The response time is how long it takes from when you press the Enter key until the computer.
At the .01 significance level, is there a difference in the mean number of times men and women order take-out dinners in a month? What is the p-value?
Find the mean, the standard deviation, and the standard error of the mean. Is it appropriate to calculate a confidence interval based on these data? Explain why or why not.
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