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The American Veterinary Association claims that the annual cost of medical care for dogs averages $100 with a standard deviation of $30. For cats it averages $120 with a standard deviation of $35.
Given independent random variables with the means and standard deviations below, find the mean and standard deviation of the following random variable: X+2Y
A study of 24 graduates of four-year colleges revealed the mean amount owed by a student in student loans was $14,381. The standard deviation of the sample was $1,892. Construct and explain a 90% co
Two percent (.02) of the items produced by a machine are defective. A random sample of 60 items is selected and checked for defects. What is the probability that the sample will contain 5% or more d
A consumer watchdog agency selects a random sample of 40 taxpayers for further study. A. What is the shape, mean(expected value), and standard deviation of the sampling distribution of the sample me
The number of viewers for the American Idol television show follows a normal distribution with a mean of 29 million and a standard deviation of 5 million. What is the probability that the next week'
What are lurking variables that could be having an effect on the negative linear relationship between car year and car value? Explain their effect.
What are the consequences of making a type II error? What is the probability of making a Type II error if the true population mean is 695 hours?
At a 1% level of significance, does your test show enough evidence to conclude that a significantly lower percentage of accounting firms offer employees flexible scheduling? What is the p-value for
An experiment can result in one or both of events A and B with the probabilities events A and B with the probabilities shown in this probability table:
If the score recorded in the grade book is the total number of points earned on the two parts, what is the expected recorded score E(X + Y)? (Enter your answer to one decimal place.)
If they go back and revise their answers, they start second guessing themselves and end up changing their choice from the correct answer to an incorrect one. For these students, the correlation betw
Tests and measurements, Need answers to questions on test.The file is attached with all the questions would like answers for all of them.
If one machine is purchased and demand is low, the net present value is $120,000. If demand is high, the manager has three options. Doing nothing has a net present value of $120,000; subcontracting,
Assume that the conditions for correlation are met. Is the following statement true or false? If it is false, explain. A correlation of 0.89 indicates a strong, position association.
If a sample of 25 boxes is randomly chosen, what is the probability that the mean will be less than 15.3 ounces? If you were in charge of filling the boxes and the sample of 25 boxes that you chose
Calculate a 99% confidence interval for the mean surface roughness of coated interior pipe. Would you expect the average surface roughness of all pipes to be as high as 2.5? Explain.
An instructor gives his class a set of 13 problems with the information that the next quiz will consist of a random selection of 3 of them. If a student has figured out how to do 9 of the problems,
What is the probability that exactly one of the computers will be defective? What is the probability that at least one of the computers selected is defective?
Two airplanes are flying in the same direction in adjacent parallel corridors. At time t = 0, the first airplane is 10 km ahead of the second one. Suppose the speed of the first plane (km/hr) is nor
Manufacture of a certain component requires three different machining operations. Machining time for each operation has a normal distribution, and the three times are independent of one another.
The national high school sports database reports that players of lacrosse average 55 goals per season. The standard deviation for goals per season is 22. To qualify for the national Junior Olympics
If you wanted to calculate the "average" percentage of people with advanced degrees across all states, would you report a mean, median or mode?
Explain why this number is so much larger than the average number of goals made. Also explain how you use the table from the back of the book to arrive at this answer.