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A new lecturer has been hired to teach an undergraduate course in psychological research methods. School records show that the average grade in this course has for many years been 75 with a standard deviation of 5. At the end of her first semester she finds that the grades are somewhat higher. Her 127 students received an average grade of 79 with a standard deviation of 6.3. She wants to know whether this higher average is significantly different from the usual average. Which test would you use to evaluate this question?   A. an independent groups t-test   B. a single sample z-test   C. a repeated measures t-test   D. a single sample t-test

A new lecturer has been hired to teach an undergraduate course in psychological research methods. School records show that the average grade in this course has for many years been 75 with a standard deviation of 5. At the end of her first semester she finds that the grades are somewhat higher. Her 127 students received an average grade of 79 with a standard deviation of 6.3. She wants to know whether this higher average is significantly different from the usual average. Which test would you use to evaluate this question?   A. an independent groups t-test   B. a single sample z-test   C. a repeated measures t-test   D. a single sample t-test

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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A new lecturer has been hired to teach an undergraduate course in psychological research methods. School records show that the average grade in this course has for many years been 75 with a standard deviation of 5. At the end of her first semester she finds that the grades are somewhat higher. Her 127 students received an average grade of 79 with a standard deviation of 6.3. She wants to know whether this higher average is significantly different from the usual average. Which test would you use to evaluate this question?

  A.

an independent groups t-test
  B.

a single sample z-test
  C.

a repeated measures t-test
  D.

a single sample t-test
Expert Solution
Step 1: Provide given information

Population mean, mu equals 75

Population standard deviation, sigma equals 5

Sample size, n equals 127

Sample mean, top enclose x equals 79

Sample standard deviation, s equals 6.3

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