The National Education Longitudinal Survey (NELS) tracks a nationally representative sample of U.S. students from eighth grade through high school and college. Research published in Chance (Winter 2001) examined the Standardized Admission Test (SAT) scores of 265 NELS students who paid a private tutor to help them improve their scores. The next table summarizes the changes in both the SAT–Mathematics and SAT–Verbal scores for these students.
Mean change in score 19 7
Standard deviation of score changes 65 49
a. Suppose one of the 265 students who paid a private tutor is selected at random. Give an interval that is likely to contain this student’s change in the SAT–Math score.
THE INTERVAL WOULD BE ±3 STD DEV FROM THE MEAN: -176, 214
(Why the stddev us 3?)
b. Repeat part a for the SAT–Verbal score. -140, 154
c. Suppose the selected student increased their score on one of the SAT tests by 140 points.
Which test, the SAT–Math or SAT–Verbal, is the one most likely to have the 140-point increase?
Explain. SAT MATH, IT HAS THE LARGER STD DEV.
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.Read more
Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.Read more
Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.Read more
Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.Read more
By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.Read more