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When a random sample of 935 parents were asked about rules in their homes, 77% said they had rules about the kinds of TV shows their children could watch.
Among the 790 of those parents whose teenage children had Internet access, 85% had rules about the kinds of Internet sites their teens could visit. That looks like a difference, but can we tell? Explain why a two-sample z-test would not be appropriate here.
The researcher computed the number of migraines individuals reported during a six-month time frame as a function of the amount of stress they reported during that same time period. There were three stress levels: low, mild, and severe.
Draw a picture of the appropriate distribution for the standardized statistic, and find the area below the value of the standardized statistic computed in part (a).
The mean number of cups was 5 with a standard deviation of 1.5 cups. The distribution was normal. What proportion of students drank 7 or more cups of coffee per day?
If slope of a straight line equation is -3 and coefficient of determination is 0.43, then correlation coefficient is?
a group of 14 friends got together for a wine contest. each guest brought his or her favorite bottle of pinot noir.
the national high school sports database reports that players of lacrosse average 55 goals per season. the standard
a quiz consists of 20 multiple-choice questions each with 5 possible answers. for someone who makes random guesses for
A physician's health study of the effectiveness of aspirin in the reduction of heart attacks was begun in 1982 and completed in 1987. Of 11,037 male medical doctors in the United States who took one 325 mg buffered aspirin tablet every other day
Create a hypothesis test which will investigate the variances. Label all steps for your test and show and label each step of the test procedure at a .1 level of significance.
A catalog sales company promises to deliver orders placed on the Internet within 3 days. Follow up calls to a few randomly selected customers show that a 95% confidence interval for the proportion of all orders that arrive on time is 88% ; 6%. Wha..
Change the last number in that set from 36 to 14 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
(a) How could an LR parser be modified to produce a leftmost parse as LL(1) parsers do? Describe your answer in terms of the algorithm in Figure 6.3.
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