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University admission officers believe that scores on the Scholastic Aptitude Test (SAT) are strongly related to academic performance. In other words, high school students who have higher SAT scores will have higher grade point averages in college. For years, officers have been using SAT scores to place college students in certain classes their freshmen year. Now the Admission Director wants to know if this policy is effective. You random sample 200 college sophomores and compare their SAT scores to their grade point average for their freshmen year. You calculate a Pearson's r for correlations and receive a value of .354 between the two variables. You also calculate the significance of your findings (using a computer) and receive a significance value of .015.
What advantage does correlation have over a cross-tab?
Is there evidence of a difference in objection to sharing information among the organizational groupings? (use α = 0.05)
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p- value.
You have two unbiased estimates, e 1 and e 2 , of a quantity with variances V 1 and V 2 respectively, and covariance Cov {e1,e 2 } = C. Form a new unbiased estimate:
Determine for each variable if it is the explanatory variable, the response variable, or whether it could be both.
Set-up/solve the problem graphically. (How many ceiling fans and how many floor fans should be made?)
Sampling variability refers to the idea that different samples will include different individuals
Compute the range and interquartile range
An advantage of the permutation test over the t test for a difference in means, can Permutation tests be used for tests when we believe the two populations differ under the null hypothesis.
Based on these data, explain whether or not course attendance had any effect on determining of a restaurants violation of health code.
Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study
Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer.
The null hypothesis is that there was no change in average liquor consumption. State this formally in terms of µ.
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