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The diameter of a shaft is normally distributed with mean 0.2508 inch and standard deviation of 0.0008 inch. The specifications on the shaft are 0.2500 plus or minus 0.0016 inch. what proportion of shafts conforms to specifications?
Four research participants take a test of mannual dexterity (high scores mean better dexterity) and anxiety test (high scores mean more anxiety). Scores are as follows:
Using your workplace, present or prior, or an organization with which you are affiliated, identify a quantitative and a qualitative variable of interest to you.
Computer science instructor, 3 statistics instructors, and 4 science instructors. If an instructor is selected, find the probability of getting a science instructor or math instructor.
You have just started own airline. You have one plane for a route connecting Austin, Boise, and Chicago. One route is Austin-Boise-Chicago and a second route is Chicago-Boise-Austin.
A random sample of 100 doctors results in 83 who indicate that they recommend brand A. The value of the test statistic z in this problem is approximately?
She wants to choose the passing grade such that the probability of passing a student who guesses on every question is less than 1/10. What score should she set as the lowest passing grade?
A college is considering making the purchase of a laptop computer a requirement for some of its programs. In the past, only 20% of students owned laptop computers. A random sample of 300 students revealed that 77 of them had laptop computers
Electric utility customer service representative answers a call is 210 seconds. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found that, on average, they were answered in 183 seconds with a population standard deviation of 30..
in a mathematics exam the average grade was 82 and the standard deviation was 5. all students with grade between 88 to
Tthe standard deviation was $32. Calculate a 95% confidence interval for the mean health cost per worker per month for all small companies.
Suppose the probability that a federal income tax return conatins an arithemetic error is 0.2. If 10 federal income tax returns are selected at random,
Suppose the probability that a carton of eggs will contain at least one broken egg is 1/3. use a simulation of 20 trials to find the probability that the next three cartons will contain only unbroken eggs.
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