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Scores derived from a patient satisfaction survey are normally distributed with u = 50 and sigma=7.5 with high score indicating high satisfaction. An SRS of n=36 with xbar=46.5. Does this observation provide strong evidence that the patient in the sample are different from the population.
A company is interested in estimating the mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
If a random sample of 40 voters is chosen, approx. the probability that more than 20 favor this candidate. Use the normal approximation to the binomial with a correction for continuity.
Use the Excel COUNTIF function to determine the number of tires that last longer than 40,000 miles. What is your estimate of the percentage of tires that will exceed 40,000 miles?
Revenue of Large Businesses A researcher estimates that the average revenue of the largest businesses in the United States is greater than $24 billion.
quality control is an important issue at acme company which manufactures light bulbs. in order to conduct testing of
To test the difference between two means using two mean z test.
A sample of 64 observations is selected from a normal population. The sample mean is 215, and the sample standard deviation is 15. Conduct the following test of hypothesis using the .03 significance level.
Income level of the industrial salespeople and their employment status. Be sure to state the critical value, the value of the Chi-square test statistic, and your decision (accept/reject).
Half of the college graduates are married. What is the probability that a randomly chosen worker is: Neither married nor a college graduate?
The challenges that face education are very interesting indeed: unlike in manufacturing (where Six Sigma methodology was originally developed) the outcome is not a product that meets stated specifications, rather it is a student who is prepared to ta..
A study of 200 commercial firms revealed the data below. What is the probability that a particular firm will have 1 million or more in income after taxes?
Assume that a hand of 12 cards is dealt from a normal deck of 52 playing cards. What is the probability that of the 12 cards, 3 will be diamonds, 3 will be clubs, 3 will be spades, and 3 will be hearts.
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