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As the new manager for a CPA firm, you want to establish the confidence interval for the time to complete a medium sized organization's tax return. A sample of 25 medium corporate accounts is selected at random. The sample mean and standard deviation are 20 days and 4 days, respectively. Using a confidence interval of 90%, construct the interval.
Standard deviation 13. in a random sample of 32 womrn aged 18-24, find the probability that the average systolic blood pressure is between 110 and 120 mm hg.
What is the probability that a randomly chosen package is improperly sealed?
The quality control inspector of a production plant will reject a batch of syringes if 2 or more defective syringes is found in a random sample of 8 syringes taken from the batch. Suppose the batch 1% defective syringes.
Compute the test statistic for the goodness of fit test. At 95% confidence using the p-value approach, test the hypotheses. What do you conclude about the distribution?
Suppose a study is conducted to test the claim, at a 0.01 significance level, that less than 75% of college students spend less than $250 per semester on text books. A survey of 700 students found that 71% spent less than $250 per semester on text..
Powers Tire Company (Which specializes in tires for vehicles ca. 1965) needs your expertise to help them schedule over the next three months. They can make tires using regular labor, or subcontracting.
Of the adult books, 70 are nonfiction while 60 of children's books are nonfiction. If the book is selected at random, determine the probability that is is?
The probability that he passes both finals is .60. What is the probability that the student will pass at least one of these final examinations?
You have an observed mean of 55, an observed standard deviation of 12. Which Z value is associated with each raw score below?
Discuss a hospitals total maintenance costs, and use regression analysis to estimate the fixed cost element of maintenance and the variable cost associated with the number of patient-days.
If the match ends when one of the teams has scored k more points than the other, find the probability that team 1 wins.
Hypothesis summary on The feasibility of hiring more employees when production increases instead of offering overtime pay to existing employees.
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