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A professor wants to compare the mid-term exam given in two different semesters to determine if...

A professor wants to compare the mid-term exam given in two different semesters to determine if one is more difficult than the other. Considering each section to be a sample of all students who might take the midterm, he compares the grades for each semester.  What type of hypothesis testing model should he use to perform his analysis?  

Dependent Sample

Independent Sample - Unknown Unequal Variance

Independent Sample - Known Variance

Independent Sample - Unknown Equal Variance
math   Statistics-And-Probability   
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Answer #1

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Correct option is:

Dependent sample

As,he is comparing grade for the same subjects in different semesters.So,subjects are dependent.

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