Statistical Tests

Question 1

When would you use the sign test?

Answer 1

• When investigating a difference
• repeated measures design
• when the data is nominal

Question 2

What are the advantages of using the sign test?

Answer 2

It is a simple test which is easy to carry out and it can be applied across a range of situations where a normal distribution can’t be assumed

Question 3

What are the disadvantages of using the sign test?

Answer 3

Nominal data is the least powerful type of data which means that the test can sometimes be unreliable.it may not be suitable for use with small samples or when the median has been used as the measure of central tendency

Question 4

How do you use the sign test?

Answer 4

1. State the hypothesis
2. Record the data and convert it into data that can be calculated.
   3.subtract the after from the before and record whether its positive or negative
   4.count up the number of positive or negative signs. The calculated S value is the lower of the 2.
3. Use the table provided to find the critical S value, if this is more than the calculated s value, the data is significant

Question 5

When would you use the mann-Whitney test?

Answer 5

When looking for a difference, when its a repeated measures design or when the data is ordinal

Question 6

When would you use the wilcoxon test?

Answer 6

When looking for a difference, when its an independent groups designer the data is ordinal

Question 7

When would you use the unrelated T test?

Answer 7

When looking for a difference, when its an independent groups design, when the data is interval or when pp ‘s are drawn from a normally distributed sample.

Question 8

When would you use the related t-test?

Answer 8

When looking for a difference, when the data is interval, or when its a repeated measures design

Question 9

When would you use spearman’s rho?

Answer 9

When working for a correlation and when the data is ordinal or interval

Question 10

When would you use Pearson’s r?

Answer 10

When looking for a correlation or when the data is interval

Question 11

When would you use chi-squared?

Answer 11

When looking for a difference or association or when the data is nominal

Question 12

What is ordinal data?

Answer 12

Data that is in a specific order

Question 13

What is interval data?

Answer 13

Data that is measured on a scale and there are equal intervals/spaces between the numbers.

Question 14

What is nominal data?

Answer 14

Data that can be separated into categories