Saturday

April 19, 2014

April 19, 2014

Posted by **ro** on Wednesday, March 21, 2012 at 6:01pm.

Students were given an exam with 300 multiple choice questions. The distribution of the scores were normal and the mean was 195 with a standard deviation of 30. you may find it helpful to draw out this distribution before answering the questions below

16. What were the scores of the students who were within one standard deviation of the mean?

17. What percentf the students did that include?

18. What were the scores of students who scored in the middle of the class?

19. If a's are given to students who score 90% or above, what is the minimum z-score of someone getting an a?

20. Let's say you got 235 on this test. Your colleague is in a different section of this course. Her score was 82 out of 100 on her test. in her section the mean was 72 and the standard deviation was 7. Which one of you did better? (hint: compare z-scores)

- math -
**PsyDAG**, Friday, March 23, 2012 at 6:21pm16. Z = (score-mean)/SD

Use Z = +1 and -1.

17. Mean ± 1 SD = 68.26% (Z Score is your score in terms of SD away from the mean.)

19. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.9000) and its Z score.

20. Take the hint given.

**Related Questions**

statistics and probability - It is known that an exam scores of students in STAT...

statistics - 5. The table below shows Psychology exam scores, Statistics Exam ...

Statistics - The next three questions refer to the following situation. Data ...

statistics - Ten members of a fraternity take a statistics course. Here are ...

statistics - 5. The table below shows Psychology exam scores, Statistics Exam ...

Statistics - In Professor Smith's statistics course, the correlation between ...

statistics - Answer the question(s) based on the following situation: 150 ...

Statistics - 5. Scores on a recent national statistics exam were normally ...

statistics - A large group of students has taken a college entrance exam. The ...

Math - Twelve students sit for an exam which has a maximum score of 100. The ...