The margin of error
A population has a standard deviation of 50. a random sample items from this population is selected. the sample is determined to be 600. at 85% confidence, the margin of error is ??
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Normal distribution with a mean value of 150 sec and a standard deviation of 20 sec. The fastest 10% are to be given advanced training. What task times qualify individuals for such training?
The average labor charge for automobile mechanics is $54 per hour. The standard deviation is $4. Using Chebyshev's theorem, find the percentage of data values that will fall in the range of $48 to $60.
If the opinion poll had announced the margin of error for 80% confidence rather than 95% confidence, this margin of error would be?
Assume that her production totals for the week were 1,075 pieces during regular hours and 200 pieces during overtime hours.
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SAT scores are normally distributed with a mean of 500 and a standard deviation of 100. What percent of test takers score less than 300?
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