probability and significance

Question 1

what is probability ?

Answer 1

A measure of the likelihood that a particular event will occur with zero indicate statistical impossibility and one statistical certainty

Question 2

What is significance?

Answer 2

A statistical terms that tells us how sure we are a difference or correlation exist

Question 3

What is critical value?

Answer 3

When testing a hypothesis, the numerical boundary or cut off point between acceptance and rejection of the null hypothesis

Question 4

What is type one error?

Answer 4

The incorrect rejection of a true null hypothesis, a false positive

Question 5

What is type two error?

Answer 5

The failure to reject a false null hypothesis, a false negative

Question 6

why is it referred as an alternative hypothesis?

Answer 6

It is alternative to the null hypothesis, so there is no difference between the conditions

Question 7

What does statistical test determine?

Answer 7

which hypothesis is true and thus whether we accept or reject the null hypothesis

Question 8

What is the usual level of significance in psychology?

Answer 8

0.05%

Question 9

When does the probability observed affect occur?

Answer 9

when there is no affect in the population is equal to or less than 5% - this means when a research claims to have found a significant difference thetr is still up to 5% chance that it isn’t true for the target population from which the sample was drawn

Question 10

what is calculated value?

Answer 10

Once a statistical has been calculated, the result is a number

Question 11

how do you check for statistical significance?

Answer 11

The calculated value must be compared with a critical value

Question 12

using tables of critical values, there are three criteria :

Answer 12

• One tailed or two tailed test ?
• The number of participants in the study this is usually as the end value of the table
• The level of significance