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The IQ scores are normally distributed with a mean of 100 and a standard deviation of 15.
1) What is the probability that a randomly person has an IQ between 85 and 115?
2) Find the 90th percentile of the IQ distribution.
3) If a random sample of 100 people is selected, what is the standard deviation of the sample mean?
Based on the above data, find a 95% confidence interval for the average score on the 1st quiz.
We have a box of 12 light bulbs. The probability that a particular light bulbs lights on opening is 0.95. This meets the binomial assumptions. Find the probability that 9 light bulbs light up.
Suppose that by the end of 2009, that percentage was 85%. If a sample of 10 U.S. adults is selected, what is the probability
What is an index number as relates to time series analysis? In a regression of a time series that states data as a function of calendar year, what requirement of regression is violated?
In 1997, 39.4% of men had made orders by phone in the last 12 months a market research analyst feels that this percentage has declined because of internet purchases. she obtains a random sample of 500 men and determines that 191 of them have made ord..
The design tolerance thickness for an automotive part is 55 mm to 65 mm. If the process mean thickness is 61 with a standard deviation of 2.3 mm, then what percentage of the sheets will be acceptable? (i.e. What percentage will fall within the des..
The ELISA test for AIDS was used in the screening of blood donations in the 1990s. As with most medical diagnostic tests, the ELISA test is not infallible.
If measurements are made instead on 4 separate days and the mean result is compared with the criterion 3.5, what is the probability that Judy is diagnosed as hypokalemic?
For each, draw the histogram of the sampling distribution of bar(y). Which sampling distribution has the smaller variance, and why?
If Weight 1 is the weight (in pounds) of a random sample of five men who were accepted as models, and Weight 2 is the weight (in pounds) of a random sample of five men who were rejected as models, which of the following is the appropriate inferenc..
In a sample of 476 adults selected randomly from one town, it is found that 9 of them have been exposed to a particular strain of the flu. Find the Pvalue for a test of the claim that the proportion of all adults in the town that have been exposed..
The professor wishes to use a random-number table to determine which letter choice should correspond to the correct answer for a question.
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