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a manufacturer of replacement parts estimates that 90% of the parts are useable. If the manufacturer sells the parts in packages of 10 parts, what are the mean and standard deviation of the numberof useable parts in a package?
Tthere is evidence that the two processes yield different average errors. Assume that the population standard deviations are equal. What is the null hypothesis?
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. A Boeing 727 co-pilot collected 61 noise observations using a handheld sound meter.
Student received the following grades last semester. Find the student's semester grade point average. Course Credits Grade/Points Statistics 4 A / 4.0.
A Tamiami shearing machine produced 8 percent defective pieces. The quality control engineer has been checking the output by almost continuous sampling. What is the probability that in a sample of 9 pieces:
A company sampled 40 of the springs that it manufactures for use in small engines and discovered that 20% of the springs did not meet specifications.
Research on new juvenile delinquents revealed that 38% of them committed another crime. What is the probability that 40 or fewer of the delinquents will commit another crime?
If you have a population that has a small sample, but does not meet all of the criteria for the nonparametric test how can you tell what test to use?
If they didn't launch new mixing plant another alternate can contribute twenty five million profit for the same period (i.e. estimated 6 years). Draw the complete decision tree and determine whether the product should be launched or not.
The engineers hoped to base their decision on the reactions of 50 drivers, but time and budget constraints may force them to cut back to 20. How would this affect the power of the test? Explain.
Determine the event that the sum of the numbers falling uppermost is less than or equal to 7
Month is uniformly distributed between 2 and 12. Find the probability density function and the cumulative distribution function of x.
Suppose that the sales manager of a large automotive parts distributor wants to estimate as early as April the total annual sales of a region.
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