inferential statistics

Question 1

critical value

Answer 1

a value taken from a statistical test table, must be reached in order for results to be significant

Question 2

observed/ calculated value

Answer 2

the number produced after the various steps and calculations for a statistical test have been carried out

Question 3

man Whitney u test

Answer 3

IMD
ordinal/interval data
looking for a difference
O value needs to be less than C to be significant

1. rank the scores from lowest to highest
   2.if there is doble of the same number two p’s rated the same, add them together and divide by how many p’s have the same score
2. add up all the ranks for each condition
3. then use formular and use it for the smallest value of ranks out of both conditions
   R1= the smallest rank score
   N1= is how many p’s where in the condition
   e.g. R1- N1(n1+1)/2

Question 4

Wilcoxon T test

Answer 4

RMD
Ordinal/interval
looking for a difference
O value needs to be less than C to be significant
1. find the difference between both sets of scores, ignore p’s with no difference
2. these differences needs to be ranked, ignore the - differences and order them smallest number to highest
3. look at the differences column and count how many positives and how many negatives there are
4. Make calculations using the less frequent sign and add the scores in rank order
5. now need to calculate the n value
n=number of difference, how many p’s had a difference ignoring the 0 differences
6. match the N value to critical Wilcoxon signed rank values. values found at 0.5 significance

Question 5

Chi square

Answer 5

IMD
nominal
looking for a difference
O value needs to be more than C to be significant
1. at totals for each column
2. the expected frequencies for each cell needs to be calculated row total x column total/ overall total which is the expected value

Question 6

Binomial sign test

Answer 6

RMD
nominal
looking for a difference
O value needs to be less than C to be significant