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1. In the extensive study involving thousands of British children, Arden and Plomin (2006) found significantly higher variance in intelligence scores for males than for females. Following are hypothetical data, similar to results obtained in study. Note that scores are not regular IQ scores but have been standardized so that complete sample has mean of M = 10 and standard deviation of s = 2.
a. Compute mean and the standard deviation for the sample of n = 8 females and for sample of n = 8 males.
b. Based on means and standard deviations, describe differences in intelligence scores for males and females.
Female Male9 811 1010 1113 128 69 1011 149 9
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Find out the expected number of correct responses under these circumstances if one in fact selects the responses at random. What is the standard deviation?
As reported by Runner's World magazine, the times of the finishers in the New York City 10-km run are normally distributed with a mean of 61 minutes and a standard deviation of 9 minutes. Let x be the finishing time for a finisher in the New York ..
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A computer password consists of four characters. The characters can be one of the 26 letters of the alphabet. Each character may be used more than once.
Frequently, tests that yield abnormal results are repeated for confirmation. What is the probability that for a normal person a test will be at least 1.5 times as high as the upper limit of normal on two separate occasions?
We are asked to investigate the hypothesis that the number of crimes is related to police expenditures because states with higher crime rates are likely to increase their police force, thereby spending more on the number of officers on the street.
Calculate a 90% confidence interval for the percentage of homes in the US that had guns at the time of survey.
Research question: Are the mean crash damages the same for these three vehicles?
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