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The mean height of women in a country? (ages 20-?29) is 63.5 inches. A random sample of 65 women in this age group is selected. What is the probability that the mean height for the sample is greater than 64 ?inches?
Assume sigma=2.63
The probability that the mean height for the sample is greater than 64 inches is ( ? )
?(Round to four decimal places as? needed.)
How accurately do the exam scores predict final grades? Compute the standard error of the estimate.
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What is the probability of finding 1 or more children with chronic bronchitis in a population where the incidence rate of chronic bronchitis is 10% (like the one above?)
Compute the ‘net' expected values for each product (i.e. expected value for its success minus expected value for its failure). Based on these ‘net' expected values, which product should the company pick?
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Assuming that the data constitute independent random samples from normal populations with equal variances, construct a 99% confidence interval for the difference between the true average heat-producing capacities of coal from the two mines
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question a population has a standard deviation of 50. a random sample of 100 items from this population is selected.
Time closely follows a normal distribution with a mean of 500 seconds and a standard deviation of 72 seconds. What percent of kiosk users take between 600 and 720 seconds?
If one or the other has to be right, what probabilities would we assign to their claims if it were found that 11 of 12 newly hired teachers stayed with the school for more than a year?
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