1
Q
What are degrees of freedom?
A
DF = n-1
Number of values in the final calculation of a statistic that are free to vary
2
Q
What does the value for the degrees of freedom influence?
A
As DF increase, the curve becomes more narrow and taller
The curve approaches “normal”
3
Q
What is a t-distribution defined by?
A
- Normally distributed population
- The random variable t
- Any sample size
4
Q
When do we use two-tail?
When do we use one tail?
A
Two-tail: Confidence intervals and x = y
One tail: Intervals other than confidence intervals
5
Q
In what scenario is the t-distribution used?
A
When making inferences about a SMALL SAMPLE (n<30)
Probability and Statistics
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