statistical testing

Question 1

alternative and null hypothesis:

Answer 1

alternative:
- directional has previous research and states the way the direction is going (one tailed)
- no previous research, doesn’t state the way (2 tailed)

null: nothing will happen

Question 2

levels of measurement:

Answer 2

nominal data- can be put into categories

ordinal data: can be ranked; scores

interval data: scores and data from which you can see the exact difference

Question 3

unrelated/related data:

Answer 3

unrelated: independent group design
related: repeated measure or matched pairs

Question 4

Mann Whitney (U):

Answer 4

• test of a difference
• unrelated data
• ordinal data

Question 5

Wilcoxon (T):

Answer 5

• test of a difference
• related data
  ordinal data

Question 6

Spearman’s rho (rho):

Answer 6

• test of correlation
• ordinal data

Question 7

Chi- squared:

Answer 7

• test of difference
• nominal data
• unrelated data

Df= (No of rows - 1) x (No of columns -1)

Question 8

unrelated T-test (T):

Answer 8

• test of difference
• unrelated data
• interval data

Df= (NA + NB) - 2

Question 9

related T-test (t):

Answer 9

• test of difference
• related data
• interval data

Df= N-1

Question 9

pearson’s r (r):

Answer 9

• test of correlation
• interval data

Df= N-2

Question 10

sign test (s):

Answer 10

• test of difference
• related data
• nominal data

S= after subtracting the two numbers write the answers with + or -. Then count up how many pluses and how many minuses. The smallest number is s.

Question 11

type 1 error:

Answer 11

rejecting the null hypothesis when it should have been accepted ( there was too much error allowed)

Question 12

type 2 error:

Answer 12

accepting the null hypothesis when it should have been rejected (there was not enough error allowed)