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The lifetime (hours) of an electronic device is a random variable with the exponential probability density function:
f(x)= 1/50 e ^-x/50 for x>=0
a. What is the mean lifetime of the device?
b. What is the probability the device fails in the first 25 hours of operation?
c. What is the probability the device operates 100 or more hours before failure?
What is the point estimate of the proportion of the population of employees who strongly dislike their current work experience (to 2 decimals)?
Real estate agents always say "location, location, location" is the most important thing in buying a house. We want to know if the sales prices of homes in two neighborhoods are similar. A random sample is taken from each neighborhood. The prices ..
What is the computed z-value for testing the null hypothesis that the proportion of successes in Population 1 exceeds the proportion of successes in Population
Of those customers using extra unleaded or premium gas, 60% fill their tanks. What is the probability that the next customer fills the tank?
Create a 98 percent confidence interval for the population mean.
Determine the probability that computer will fail within 12 months?
Determine relative frequency of X=4? Generate the cumulative frequencies.
From the following information for Alfred Industries compute the overhead spending variance and the volume variance:
What is the null hypothesis? What is your decision if a = 0.01?
a) Explain why it would be hard to take a Simple Random Sample? b) Describe how to take a cluster sample of chocolate chip cookies.
Determine the value of population mean? What is the best evaluate of this value?
To develop 3-month and 2-month moving average for the time series.The following data represents demand for company ABC's products for the last 10 months.
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