Inferential Statistics

Question 1

Where are the mean media and mode in a normal distribution curve

Answer 1

They are all in the centre of the curve ( at the peak)

Question 2

In a normal distribution curve what parentage of the data is it the first sd, second sd and third sd

Answer 2

1st = 68%
2nd= 95%
3rd = 99.7%

Question 3

When would we do a parametric test

Answer 3

-when the data is normally distributed
-when the dat is interval/ratio

Question 4

What happens to the measures of central tendencies in a left/negative skew and where does the tail go

Answer 4

Mean is the lowest value , median is the middle value and mode the highest value
The tail goes of to the left.
(Mode is allows the highest point of the curve and means is on the tail bit )

Question 5

What happens to the measures of central tendencies in a right /positive skew and where does the tail go

Answer 5

Mode is the lowest value , median is the middle value and mean the highest value
The tail goes of to the right.
(Mode is allows the highest point of the curve and means is on the tail bit )

Question 6

What is the definition of probability

Answer 6

The likelihood that a certain pattern in the data could be due to chance rather than the actual variables being studied

Question 7

What is the definition of significance

Answer 7

A significant result is one where there is a low probability that chance factors were responsible for any difference or correlation in the results

Question 8

How do we determine if our results are significant or not

Answer 8

We perform a statistical test

Question 9

What does it mean if the significance is high

Answer 9

The probability of the results being due to chance is low

Question 10

What does it mean if the significance is low

Answer 10

The probability that the results are due to chance is high

Question 11

What does p <_ 0.05 mean

Answer 11

The probability of the results being due to chance is 5% and the probability of the results being due to the iv affecting the dev is 95%

Question 12

If our results are significant what do we do the hypotheses

Answer 12

Accept experimental
Reject null

Question 13

If our results are not significant what do we do the hypotheses

Answer 13

Accept null
Reject experimental

Question 14

What are the two types of error

Answer 14

Type 1 (too lenient)
Type 2 (too strict)

Question 15

What happens in a type 2 error

Answer 15

When we think that there was no effect but there was you were just too strict . This would mean that you would accidentally accepted the null which you should’ve rejected

Question 16

What happens in a type 1 error

Answer 16

When we think that there was an effect but there was you were just too lenient . This would mean that you would accidentally accepted the experimental hypothesis which you should’ve rejected

Question 17

What factors affect the stats test that you use

Answer 17

1) research method
2) design of experiments
3) level of measure
4) distribution and spread of scores

Question 18

What is the rhyme to remember what non parametric test to use

Answer 18

Under red churches nuns can’t backflip over men without shirts

Question 19

How do you know which tests use the greater than or equal to sign

Answer 19

If they have an r in their name ( ignore the ranks part of wilcoxon)