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The time (in hours) required to repair a machine is an exponentially distributed random variable with parameter ?= 1.
(a) What is the probability that a repair time exceeds 2 hours?
(b) What is the conditional probability that a repair takes at least 3 hours, given that its duration exceeds 2 hours?
one year professional sports players salaries averaged 2 million with a standard deviation of 1 million. suppose a
Absolutely lost on how to determine what is being asked in below problem. Need to calculate the covariance and correlation between X and Y
Consider the following age data, which is the result of selecting a random sample of 20 United Airlines pilots.
If the least squares equation for sales data going from 1984 to 1990 is Y1 = 10 + 1.3X (in $ millions) found using the coded method, what is the plot on the straight line for 1988? (x and y values)
A hospital human resources manager finds that the local average starting salary for nurses is $24,000. She randomly samples 10 nurse's salaries at the hospital and calculates a mean of $23,450 and a standard deviation of $400.
Construct a 95% confidence interval estimate of the difference in kilometers per liter. Do the results of parts (a) and (b) agree? Explain why or why not.
Why do you use the chi-square statistic? Explain. What type of data is used with chi square analysis? Explain. What are the hypotheses in a chi-square test for independence? Explain.
the proportion of students in private schools is around 11. a random sample of 450 students from a wide geographic area
Given the following raw scores, calculate the following values: Range, Variance and Standard Deviation, show your calculations: Scores: 9, 7, 8, 4, 8, 8,7, 8, 9, 6, 3
a team of researchers wants to determine whether pet owners are generally more satisfied with their lives than non-pet
Simulate a completely random process of length 48 with independent, normal values. Plot the time series plot. Does it look "random"? Repeat this exercise several times with a new simulation each time.
a manufacturer produces lightbulbs at a poisson rate of 239 per hour.the probability that a lightbulb is defective is
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