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Stats28 - Essay Example

Summary
This sample is sufficient to conclude that there is a real non-zero correlation in the population. (Assume a two-tailed test with α = .05.)
A college professor reports that students who finish exams early…

Extract of sample"Stats28"

Download file to see previous pages The correlation between amount of TV with violent content and amount of violent behavior is an example of ____.
2. For each of the following, determine whether the sample provides enough evidence to conclude that there is a significant, nonzero correlation in the population.  In each case, use a two-tailed test with α = .05.
For a two-tailed test with α = .05, critical value of r with df = 16 is ±0.468. r = -0.50 is less than -0.468. Thus, the sample provides enough evidence to conclude that there is a significant, nonzero correlation in the population.
For a two-tailed test with α = .05, critical value of r with df = 13 is ±0.514. r = -0.50 is greater than -0.514. Thus, the sample does not provide enough evidence to conclude that there is a significant, nonzero correlation in the population.
For a two-tailed test with α = .05, critical value of r with df = 28 is ±0.361. r = -0.375 is less than -0.361. Thus, the sample provides enough evidence to conclude that there is a significant, nonzero correlation in the population.
For a two-tailed test with α = .05, critical value of r with df = 23 is ±0.396. r = -0.50 is less than -0.396. Thus, the sample provides enough evidence to conclude that there is a significant, nonzero correlation in the population.
4. A professor obtains SAT scores and freshman grade point averages (GPAs) for a group of n = 15 college students.  The SAT scores have a mean of M = 580 with SS = 22,400, and the GPAs have a mean of 3.10 with SS = 1.26, and SP = 84.
a.  A geneticist might wonder if there is a tendency for tall fathers to have tall sons and short fathers to have short sons.  Answer this question by computing the appropriate statistic and testing it for statistical significance.  (Hint:  The statistic will be much easier to compute if you subtract 40 from each of the scores.  Doing so will not affect the value of the ...Download file to see next pagesRead More
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