Other tests

Question 1

The Welch test statistic

Answer 1

Compares the mean difference to its estimated SD by taking the ratio

Question 2

Non-Independent Data (Paired t-test)

Answer 2

t.test(…, paired = T)
just a 1-sample t-test

Question 3

To find the “best” line

Answer 3

sum the square of the residuals (“gaps”) between our line (model) and our observations (data), and look for the line which gave the minimum sum of squared gaps (usually referred to as “sum of squares”)

Question 4

When to use the Chi^2 test

Answer 4

• To test the hypothesis that each value appears a certain amount of times (frequency of diff categories)
• Test for independence