Z-test and T-test
Flashcard
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Mathematics
•
University
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Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is a Z-test?
Back
A Z-test is a statistical test used to determine whether there is a significant difference between the means of two groups when the population variance is known and the sample size is large (n > 30).
2.
FLASHCARD QUESTION
Front
What is a T-test?
Back
A T-test is a statistical test used to determine whether there is a significant difference between the means of two groups when the population variance is unknown and the sample size is small (n < 30).
3.
FLASHCARD QUESTION
Front
What are the null and alternate hypotheses?
Back
The null hypothesis (H0) states that there is no effect or no difference, while the alternate hypothesis (H1) states that there is an effect or a difference.
4.
FLASHCARD QUESTION
Front
What is the notation for the null hypothesis?
Back
H0
5.
FLASHCARD QUESTION
Front
How do you calculate the degree of freedom for a sample?
Back
DF = n - 1, where n is the sample size.
6.
FLASHCARD QUESTION
Front
What is the degree of freedom if the sample size is 20?
Back
19 (DF = 20 - 1).
7.
FLASHCARD QUESTION
Front
When should you use a Z-test?
Back
Use a Z-test when the population variance is known and the sample size is large (n > 30).
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