A researcher is interested in studying the difference in the average level of anxiety among college students who are in their first semester of college compared to students who are in their final semester of college.  The researcher has a sample of 62 students in their first semester and 60 students in their final semester and conducts a two-sample t-test (two-tailed, alpha = .05).  The researcher finds the following: 1. Students in their first semester of college (group 1) have an average anxiety score of 1.8. 2. Students in their final semester of college (group 2) have an average anxiety score of 2.8. 3. The standard error of the mean difference between students in their first semester and final semester (i.e., the se) is .20. What are the degrees of freedom for this test?  Enter your answer as a whole number with no decimal places (i.e., 10, not 10.1, not 10.10).

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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A researcher is interested in studying the difference in the average level of anxiety among college students who are in their first semester of college compared to students who are in their final semester of college.  The researcher has a sample of 62 students in their first semester and 60 students in their final semester and conducts a two-sample t-test (two-tailed, alpha = .05).  The researcher finds the following:

1. Students in their first semester of college (group 1) have an average anxiety score of 1.8.

2. Students in their final semester of college (group 2) have an average anxiety score of 2.8.

3. The standard error of the mean difference between students in their first semester and final semester (i.e., the se) is .20.

What are the degrees of freedom for this test?  Enter your answer as a whole number with no decimal places (i.e., 10, not 10.1, not 10.10).

Expert Solution
Step 1

Given that 

group 1 --- n1 = 62 , x1 bar = 1.8 ,

group 2  --- n2 = 60 , x2 bar = 2.8 , standard error = 0.20

degrees of freedom=?

 

 

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