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Question: Lowering the drinking age. A July 2007 Gallup Poll asked a random sample of 464 adults whether they would favor or oppose a federal law that would lower the drinking age in all states to 18. Among the respondents, 357 said they would oppose such a law. We can act as if the sample were an SRS. Is this good evidence that more than 3/4 of American adults would oppose a federal law that would lower the drinking age in all states to 18? Show the five steps of the test (hypotheses, sampling distribution, data, P-value, conclusion) clearly.
suppose x y and c represent the length width and perimeter of a flat rectangular sheet metal part. note that x is a
At the .01 significance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
The statistical significance of changes to R2 depends on the number of variables added to the model. In these examples, the current regression has four explanatory variables with R2 = 0.60 and has been fit to n = 75 observations.
here are the golf scores of 12 members of a college womens golf team in two rounds of tournament play. a golf score is
This is an Excel sheet that calculates both probabilities and percentiles for any normal or standard normal probability distribution. Replaces normal probability tables.
What is the response variable?- What is n, the number of cases?- What is p, the number of explanatory variables?- What are the explanatory variables?
the average tenure of technicians at abc company is 10 years with a standard deviation of 5 years. calculate the
What's The POPULATION of interest to the American company?
What is the point estimate for the proportion of people preferring model B, write suitable null and alternative hypotheses in words and symbols for this problem.
Knowing nothing about any team, you flip fair coins to decide every one of your 63 bets. Compute the expected number of points
Determining whether or not the proportion of the population in favor of Candidate A is significantly more than 80%. The value of the test statistic and the p-value respectively are?
the typical amount of sleep per night for undergraduate college students has a bell shaped distribution with a mean of
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