Question

the probability distribution used in the t - test, especially when the sample size is small, is the distribution.
the measures the degree to which individual data points differ from the mean.
when interpreting hypothesis testing results, the significance considers the real - world importance of the findings.

Explanation:

1. The t - test uses the t - distribution, especially for small sample sizes.
2. Variance or standard deviation measures how data points differ from the mean.
3. Practical significance considers real - world importance in hypothesis testing.

Answer:

1. t
2. variance (or standard deviation)
3. practical