Inferential stats

Question 1

When is the sign test used?

Answer 1

When looking for a difference between conditions.
(eg: an experiment, not a correlation)

Question 2

Which design of study is a sign test used in?

Answer 2

In a repeated measured design.

Question 3

What kind of data is used in sign tests?

Answer 3

Nominal data (frequency data that is in categories).

Question 4

How do you complete a sign test?

Answer 4

1 - Record the data
2- Convert to nominal data by stating the sign (- or +)
3 - Add up how many + you have and how many - you have. Take the lower number
The smaller number is your calculated value (aka observed value) and is quoted as being s=

Question 5

Can you be 100% certain your results weren’t a change finding?

Answer 5

No

Question 6

What is the traditional accepted level of significance/probability in psychology?

Answer 6

P <0.05
or
probability that our results are due to to chance is less than or equal to 5%

Question 7

How do you find out if your test results are significant?

Answer 7

By calculating (using stats) the probability that the results are due to chance.

Question 8

How do you find the critical value?

Answer 8

Using a critical value table.

Question 9

What is the statement of significance?

Answer 9

The calculated value (state no.) is greater/less/equal to the critical value (state no.), at 5% probabilities, for a one/two tailed hypothesis. Therefore the result are (not) significant and i can accept/reject my null hypothesis.