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12 machines are planned to be used for a 60-day production run. The actual operating time is 1440 hours. Upon failure a machine must be returned to the manufacturer for repair. The turnaround time is at least 90 days and an average of 110 days. The per machine failure rate is 0.01 failures per operating hour. (failures follow poisson distributions)
What is the expected number of machines failures during the prodution run?
it is found that when a particular 4-sided die is rolled a 1 occurs 26.9 of the time a 2 occurs 23.8 of the time a 3
The variance of the return per share is 4 for stock 1 and 100 for stock 2. The covariance of the return between the two stocks is 5 per share. Use the total variance of the investment as investment risk.
Develop a regression model to predict the price of stock 1 and 2 based on the Dow Jones Industrial Average
A researcher studies the relationship between political attitudes and income. He/she finds that those with higher income are more conservative.
You are conducting a study for which it is critical that the findings be representative of the population of interest. Which of the following research methods runs the greatest risk.
At α = 0.10 test the claim that there is a difference in means of the salaries. (a) State the Hypotheses: (b) Compute the Test statistic: (Round off correctly)
The Rathburn Manufacturing Company makes electric wiring, which it sells to contractors in the construction industry. Approximately 900 electric contractors purchase wire from Rathburn annually.
Develop a simple regression model that relates electricity usage to home size. What is the resulting regression equation?
Provides a measure of skewness in the distribution of X. Determine the value of b3 for this distribution and using a suitable distributional approximation, find the probability that the mean of a random sample of n = 25 observations will exceed 2.5.
The Financial Advisor exam has a mean of 500 and a standard deviation of 20. If the bank chooses to hire either Steve or Mark based solely on their exam performance, who is the bank more likely to hire? Show evidence for your answer.
What sample size must be taken to estimate the average gas price in houston with 99% confidence and max error of 5 cents? Assume population standard deviation of gas prices is 60 cents.
How many more days should be included in the sample to be 95% sure the population mean μ is within $50 of the sample mean x?
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