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
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 26PFA
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Question
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 |
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