A study conducted by UCLA's Cooperative Institutional Research program found that 39.5 of college freshman spent six or more hours a week studying or doing homework during their senior year in high school.
To verify these results, a random sample of 200 freshmen was asked how many hours they studied a week during their senior year in high school. A total of 88 students from this sample responded that they studied six or more hours a week. Which of the following statements is correct?A) The interval that contains 95 of the sample proportions is 0.3647 and 0.4253. Because the sample proportion is between these two values, we have support for the results of UCLA's study.
B) The interval that contains 95 of the sample proportions is 0.3647 and 0.4253. Because the sample proportion is not between these two values, we have support for the results of UCLA's study.
C) The interval that contains 95 of the sample proportions is 0.3272 and 0.4628. Because the sample proportion is between these two values, we have support for the results of UCLA's study.
D) The interval that contains 95 of the sample proportions is 0.3272 and 0.4628. Because the sample proportion is not between these two values, we do not have support for the results of UCLA's study.
Question 2
If adding an independent variable results in a reduction in the adjusted , we have evidence that the new variable might not be contributing enough explanation of the dependent variable to remain in the model.
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