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What's the effect? A researcher studying violent behavior in elementary-school children asks the children s parents how much time each child spends playing computer games and has their teachers rate each child on the level of aggressiveness they display while playing with other children.
Suppose that the researcher finds a moderately strong positive correlation. Describe three different possible cause-and-effect explanations for this relationship.
Experts claim that 10% of murders are committed by women. is there enough evidence to reject the claim if in a sample of 67 murders, 10 of them were committed by women? use a significance level of .01
During the past six months, 73.2% of US households purchased sugar. Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10. 80% of the households spent more than what amount?
What is the probability that between 10:00 and 10:30 the switchboard will receive more than 9 calls but fewer than 15 calls?
At the .05 significance level, can we conclude that the guideline is still reasonable?
If you repeatedly select two sample values, what is the mean value of the sample variance s2? The preceding parts show that s2 is an unbiased estimator of s2. Is s an unbiased estimator of u?
A coin that comes up heads with probability 0.6 is continually ?ipped. Find the expected number of ?ips until either the sequence thht or the sequence ttt occurs, and ?nd the probability that ttt occurs ?rst.
if x is a random variable having a binomial distribution with n20 and p0.4 and y is a transformed version of x where
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
A biologist had mice and rats run through a maze and recorded the number that finished the maze successfully and the number that did not. This table lists the results of the study.
Indicate at which point flat-of-curve medicine is experienced in the following example (imagine that antibiotics have been prescribed for a given population of 1,000 elderly persons).
Given the probability you've calculated, would you suggest that Donald drop his plan to list himself in the yellow pages as a psychic phenomenon?
Give an example of a repeated measures analysis of variance (ANOVA)--no examples of therapy or temperature.
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