stat tests

Question 1

statistical tests

Answer 1

provides a way of determining whether hypotheses should be rejected or accepted

tells us whether differences or relationships are statistically significant or due to chance

Question 2

sign test

Answer 2

• Looked for a difference not an association.
• Used a related experimental design- repeated measures design.
• Collected nominal data.

Question 3

how to conduct a sign test

Answer 3

Step 1 - State the hypotheses - both alternative and null
Step 2 - Record data and work out the sign. For example, the sign will be negative (-) if the value has decreased in the second condition but positive (+) if it has increased. If the value has stayed the same, this value will be ignored and the N adjusted to exclude it.
Step 3 - Find the calculated value for the sign test, S, which is the number of times the less trequent sign occurs
Step 4 - critical value of S - N value (total number of values) and p 0.05

Question 4

inferential stat tests

Answer 4

rel unrel correlation
nom sign test chi-squared chi-squared
ordin wilcoxon mann-whitney spearman’s rho
interval related t-test unrel t-test pearson’s R

Question 5

rule of R

Answer 5

if R in name - calculated value must be greater or equal to critical value