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A manufacturer of automobile batteries claims that the average length of life for its grade A battery is 60 months. Suppose the standard deviation of the life length is known to be 10 months.
a) Approximately what percentage of the manufacturer's batteries will last between 40 months and 80 months?
b) suppose your battery lasts 37 months. What could you infer about the manufacturer's claim?
The Food King Chain employs more than 3,000 people. The worker's ages are approximately normally distributed, with a mean of 31 years and a standard deviation of 4.3 years.
Assume the probability that a person has the desease is 0.03 for all people, independently of each other, and compute the expected number of tests necessary for each group.
An auditor for Health Maintenance Services of Georgia reports 40% of policyholders 55 years of older submit a claim during the year. Fifteen policyholders are randomly selected for company records. How many of the policyholders would you expect to ha..
A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years.
Find a 95% confidence interval for the proportion p of the inner-city, working-class group who eventually became alcoholics.
The standard deviation of test scores on a certain achievement test is 10.5. A random sample of 150 scores on this test had a mean of 72.8.
A sample of patients for one busy primary care practice is used as the comparison group. What is the research design and its variables?
Sstandard deviation of the test scores are 74 and 2, respectively, and the distribution of scores is bell-shaped and symmetric. Suppose the trainee in question received a score of 69. Compute the trainee's z-score.
Given that a Brand A battery just failed, what is the expected value of the time we wait until the next Brand B failure?"
Illustrate what does weighting add to usefulness of moving averages and explain how is it done. The yield on a thirty year treasury note at the end of every year since 1990 is recorded below.
Automatic sensors to watch for lightening in a sample of 10 square kilometers. What are the mean and standard deviation of x, the mean number of strikes per square kilometer?
Compute the expected number of barrels that will be sol on Saturday. (Answer to Whole numbers)
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