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Violent acts on prime-time TV. A typical hour of prime-time television shows three to five violent acts. Linking family interviews and police records shows a clear association between time spent watching TV as a child and later aggressive behavior
(a) Explain why this is an observational study rather than an experiment.
(b) Suggest several variables describing a child's home life that may be related to how much TV he or she watches. How would the effects of these variables make it difficult to conclude that more TV causes more aggressive behavior?
the average magnesium concentration in ground water around metro city is u65.6 parts per millionppm with a standard
Develop a Venn diagram to illustrate the data, hence use it to find the probability that a worker picked at random: (1) Does not speaker English, (2) Speak neither of the languages, (3) Speak French and Russian but not English.
Find a 98% con?dence interval for the mean P/E multiples. Interpret the result and state any assumptions you have made.
You would like to take an advantage of the higher yield investment but have only $500 available. What is the maximum rate of return that you would pay to borrow the $200 need to take advantage of the high yield investment?
using a significance level of .05, test the hypothesis that the intake of linoleic acid in this group is lower than that of the general population. Also, compute a p-value for the hypothesis test.
Describe the sampling distribution of the sample mean.
as part of a public health survey a random sample of college students were asked about their weekly drinking habits.
In a lengthy manuscript, it is found that only 2/3 of the pages contain no typing errors. Assume that the number of errors per page has a Poisson distribution.
according to the internal revenue service income tax returns one year averaged 1332 in refunds for taxpayers with a
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
a certain city divides naturally into ten district neighborhoods. how might a real estate appraiser select a sample of
The probability model below describes the number of repair calls that an appliance repair shop may receive during an hour.- How many calls should the shop expect per hour?
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