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The purpose of an automobile timing belt is to provide a connection between the camshaft and the crankshaft. This allows the valves to open and close in sync with the pistons. Suppose the duration of a timing belt (in miles) can be modeled by an exponential random variable with parameter ?? = 0.00002.
What are the expected value and variance of the duration of a timing belt?
What is the probability that a randomly selected timing belt lasts for more than 60,000 miles?
If the timing belt on a new car breaks within 20,000 miles, the dealer will install a new belt free of charge. What is the probability that the dealer will be forced to install a new timing belt free of charge on a randomly selected car?
What is the 80th percentile of the duration of timing belts?
Approximately normally distributed with a mean of 32 hours and a standard deviation of 2 hours. What percent of the garages take between 30 and 34 hours to erect?
Suppose the population mean is 50.6 pounds with a population standard deviation of 1.62 pounds. Suppose we take thousands of samples with a sample size of 5.
By using significance level a = .05, and suppose a normal distribution what does evidence conclude?
What is the break-even cost? What is the profit for 75 units of feed sold? How many units must be sold to produce a profit of $1020?
for the data in the following sample8 1 5 1 5a. find the mean and the standard deviation.b. now change the score of x 8
Students revealed and average cost of books of $370 per student. The Dean of Students believes that cost are greater this semester. What is the test value for this hypothesis?
Can the researcher conclude that humidity has a significant effect on eating behavior? Use a two-tail test with α = .05.
The changes on different days are assumed to be independent. What is the probability that after 2 days the stock will be at its original price? What is the probability that after 3 days the stock's price will have increased by 1 unit?
5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. What proportion of faculty consume an amount between 4 and 6 cups?
Let = the sample mean of the 100 scores from University X, and = the sample mean of the 100 scores from University Y. What is the probability that will x be greater than y?
I performed a linear regression for the Population to the monthly profit, but do not understand how to use the information. And I do not understand the confidence interval estimate; how do I use and decipher the info.
Define or give an example of a hypothetical construct. Explain why operational definitions are needed to define and to measure constructs.
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