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he average breaking strength of a certain brand of steel cable is 2000 pounds, with a standard deviation of 100 pounds. A sample of 20 cables is selected and tested. Find the sample mean that will cut off the upper 95% of all samples of size 20 taken from the population.
Calculate a 95% confidence interval for the average lifetime of the washing machines that the company uses. Calculate the sample size required to reduce the margin of error for a 95% confidence interval down to 7 (i.e. E = 7).
What is an example of a directional alternate hypothesis? What is an example of a non-directional alternate hypothesis?
The probability density of the net weight in ounces of a packaged compound is f(x)=2.0 for 19.75
To test this claim, a researcher obtains information about registered drivers from the department of motor vehicles and selects a sample of n=300 accident reports from the police department.
Compute test statistic for sample data that you would use to test whether sample mean varies from population mean of 10 pounds at a 5 percent level of significance in two-tailed test.
Determine standard deviation be if sample contained 100 students rather than 50? How large the sample is required to decrease standard deviation of percentage who say "Yes" from 7% to 3.5%?
What is the difference between a causal model and a time- series model? Give an example of when each would be used. What are some of the problems and drawbacks of the moving average forecasting model?
The technician has just made an attempt to calibrate the machine. a. What is the probability that the machine is in adjustment?
A corporate CEO reviews the earnings of three divisions over the last eighteen months. Each division reports its earnings quarterly.
Using the 0.10 level of significance, is there evidence that the population mean is above $300?
Which of the following assumptions is not made for the F-test for comparing three or more means?
The mathematics SAT scores of the seven students in a mathematics seminar are 533, 553, 578, 586, 619, 626, and 633. Suppose that the student with the score of 533 drops the seminar and is replaced by a student with a score of 765.
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