Research methods- Inferential testing

Question 1

What pneumonic can be used to remember the order of the inferential tests ?

Answer 1

Silly Will Really Cheeky Man When Under Cheeky Silly Pete

Question 2

Draw the table used to decide what inferential test to use

Answer 2

Nominal Ordinal Interval

Related Sign test Wilcoxon Related t-test

Unrelated Chi squared Mann Whitney Unrelated t test

Correlation Chi squared Spearman’s RHO Pearsons r

Question 3

How do you calculate the sign test ?

Answer 3

1- Calculate the difference in scores between the two conditions and note the sign
2- Work out the number of participants and ignore any that have no change
3- Work out the S, this is the most frequent number of positives or negatives
4- Use critical value table to compare and work out if significant

Question 4

What is a type one error ?

Answer 4

The incorrect rejection of a null hypothesis which is actually true. A false positive

Question 5

What is a type 2 error ?

Answer 5

The failure to reject the null hypothesis that is false. A false negative