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Test-preparation organizations like Kaplan, Princeton Review, etc. often advertise their services by claiming that students gain an average of 100 or more points on the Scholastic Achievement Test (SAT). Do you think that taking one of those classes would give a test taker 100 extra points? Why might an average of 100 points be a biased estimate?
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Correlation and CausationContains unread posts
A few random results for you to ponderdo the results justify the conclusions? Why or why not? Pick one or two statements and comment.
In the NFL, teams win more often when they score 13 points than when they score 14. Thus, scoring points is bad.
Often when people use regression analysis to estimate the effect of police officers or police spending on crime, they find that cities with larger police forces/budgets have higher crime rates. Therefore, police cause crime.
As ice cream sales increase, so do drowning deaths. Thus, ice cream causes people to drown.
Studies find that students who drink more tend to have lower grades. Therefore, drinking leads to poor student performance.
Over the past 300 years, there has been a decrease in the number of pirates on the high seas, along with an increase in average global temperatures. Thus, the reduction in piracy has led to global warming.
Did you know there is a health benefit to winning an Oscar? Doctors at Harvard Medical School say that a study of actors and actresses shows that winners live, on average, for four years more than losers. And winning directors live longer than non-winners.
Children who come further down in the birth order have, on average, lower IQs than those born earlier in the birth order (e.g. First born children vs. 5th born children). Therefore birth order determines intelligence.
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View profile card for Azuka christian Ossai
Azuka christian Ossai
November 2 at 9:51 PM
Quiz 10 Problems Missed
There were only a few questions missed. I attached solutions. Also the actual correct answers should help. They are available now If you have any questions, please ask.
problems 1 and 3
The null hypothesis is the first choice that all three population means are equal. The alternative is that they are different or that at least two are different. They say the same thing.
problem 4
problem7
