Difference between revisions of "EBook Problems Normal Critical"
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A statistics professor teaches two different sections of the same class. To prevent cheating, the classes get different midterms. This year, the midterm for Section A had a mean of 60% with a standard deviation of 10%. The midterm for Section B had a mean of 65% and a standard deviation of 5%. Kefei scored 75% in Section A, while her friend Bob in Section B scored 75%. Grades on this midterm are based upon how each student does relative to the other students in his or her class. | A statistics professor teaches two different sections of the same class. To prevent cheating, the classes get different midterms. This year, the midterm for Section A had a mean of 60% with a standard deviation of 10%. The midterm for Section B had a mean of 65% and a standard deviation of 5%. Kefei scored 75% in Section A, while her friend Bob in Section B scored 75%. Grades on this midterm are based upon how each student does relative to the other students in his or her class. | ||
Revision as of 20:45, 18 December 2008
EBook Problems Set - Nonstandard Normal Distribution: Finding Scores (Critical Values)
Problem 1
Given the following summary statitics, which of the statements below is true?
Chemistry test score of Class A: Mean = 70 Standard deviation = 10 Chemistry test score of Class B: Mean = 70 Standard deviation = 5
Jack is in class A and got a score of 80 John is in class B and got a score of 80
- Choose one answer.
- (a) John's performance in chemistry is better than Jack's.
- (b) Jack and John did equally well in chemistry.
- (c) John's and Jack's scores in chemistry are not comparable.
- (d) We need more information to compare Jack's and John's scores.
Problem 2
A statistics professor teaches two different sections of the same class. To prevent cheating, the classes get different midterms. This year, the midterm for Section A had a mean of 60% with a standard deviation of 10%. The midterm for Section B had a mean of 65% and a standard deviation of 5%. Kefei scored 75% in Section A, while her friend Bob in Section B scored 75%. Grades on this midterm are based upon how each student does relative to the other students in his or her class.
Which of the following best describes the situation?
- Choose one answer.
- (a) Because the midterms contained different questions, we can't compare their performance.
- (b) Relative to other classmates, both Bob and Kefei did equally well.
- (c) Relative to other classmates, Bod did better on the exam than Kefei.
- (d) Relative to other classmates, Kefei did better on the exam than Bob.
- Back to Ebook
- SOCR Home page: http://www.socr.ucla.edu
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