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Shaver Manufacturing, Inc. offers dental insurance to its employees. A recent study by the human resource director shows the annual cost per employee per year followed the normal probability distribution, with a mean of $1,280 and a standard deviation of $420 per year.
a. What fraction of the employees cost more than $1,500 per year for dental expenses?b. What fraction of the employees cost between $1,500 and $2,000 per year?c. Estimate the percent that did not have any dental expense.d. What was the cost for the 10 percent of employees who incurred the highest dental expense?
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
What is the 90% confidence interval estimate of the difference between two population means.
A company has developed the new battery, but the average lifetime is unknown. In order to estimate the average, a sample of 150 batteries is tested and an average lifetime of this sample is found to be 250 hours.
Listed below are the highway fuel consumption amounts (in mi/gal) from cars in three different categories. Use a 0.05 signifiacance level to test the claim that the different car categories have the same median highway fuel consumption.
Test whether there is difference in the two population mean. Use p-value approach
What is the difference between hypothesis and theory? If there is a difference between the two, what comes first - hypothesis or theory?
Test the claim about population mean, u, at given level of significance using given sample statistics. Find out critical value(s).
Construct a 95% confidence interval estimate for the average waiting time of all the patients who visit this doctor. Assume the population of waiting times is normally distributed.
What can you conclude from chebychev's theorem about the percentage of adults in the town whose heights are between 59.7 and 72.9 inches? Show all work.
M&M Confidence Interval regarding the count of each color of M&M contained in a "fun size" bag of M&Ms for hypothesis testing. Use the traditional hypothesis testing method,
The pet-drug market is growing very rapidly. Before new pet drugs can be introduced into the market place, they must be approved by the U.S. Food and Drug Administration.
The probability of his passing english is 0.8, but the probability of his passing both is 0.6. What should be his estimate of the probability of his passing math?
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