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The yearly cost of dental claims for the employees of the local shoe manufacturing company is normally distributed with a mean of $105 and a standard deviation of $35. What is the yearly cost at which 35% of the employees fall at or below?
Explain how the Central Limit Theorem can help you convince your boss that while you can't get rid of sampling error the results from your statistical work (that is based on sampling) can still be useful.
A cell phone company collects data from a random sample of 500 households. The results indicate that 135 of the households would add an extra cellular number, provided it was offered at a reduced monthly cost.
Joe is considering pursuing an MBA degree. He has applied to two different universities. The acceptance rate for applicants with similar qualifications is 25% for University A and 40% for University B.
determine a 95 confidence estimate for the mean time between failures mtbf of a power supply. we have 200000 hours
Children toilet train (training age normally distributed) at an average of 26 months with a standard deviation of 2 months. How lilely is child to be trained after 30 months?
discuss some of the common uses of jq tests. do you think that iq tests should be used for these purposes? does the
Determine the probability that the sample mean is 20 or higher? What is the probability that the sample mean falls within 2 points of the population mean?
If garage is robbed, determine the probability doors were left open?
in a manufacturing process a random sample of 49 bolts manufactured has a mean length of 1.67 inches with a standard
researchers collected data from a random sample of men and women to determine if women spend more time doing housework
What is the largest possible value of the covariance? Remember that r can be positive or negative and what is the covariance between X and Y
a researcher would like to evaluate the claim that large doses of vitamin c can help prevent the common cold. one group
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