Definitions
What is mean?
The average score in a group
How do you calculate mean?
Add all the scores together and divide by the number of participants
The test used for experimental designs
T test
Data that has a true zero
Which group has the greatest uncertainty
Group one: 95% confidence intervals 20=79
Group two: 95% confidence intervals 40-58
Group 1
What is standard deviation?
Which group had the higher variance:
Group 1: SD = 52
Group 2: SD = 67
Group 2
An unpaired t test is used for...
Parametric data, independent (between) groups
What is interval data?
Data that doesn't contain a true zero
Calculate type II error when power is 0.61
0.39 or 39%
What is p value
It tells us if the results are statistically significant OR the probability that the results occurred by chance
What unit of measurement is mean an appropriate measure of central tendency for?
Ratio data
A paired t test is used for...
Parametric data, repeated measures
Data that moves up in an order e.g. a scale of 1-10
What do confidence intervals tell us?
The range of data that contains the true population mean
The probability that a statistically significant result was detected in the sample (measured from 0-1)
Mean = 8.39
Participant scores: 5, 7, 10, 14, 7, 12, 8, 9, 5
How many people scored above the mean?
4
If p value is 0.005, what hypothesis is accepted?
Alternative
What is nominal data?
Data that does not contain a numerical value
What is repeated measures?
The same group is tested twice
What is type I and type II error?
Type I - false positive
Type II - false negative
Is this an example of Descriptive statistics or Inferential statistics? The average hours of sleep for a year 11 Psychology class was 7.35
Descriptive statistics
If p value is 0.42 what hypothesis is accepted?
Provide an example of ratio data
Draw a conclusion about the relationship between the two groups:
Group 1 mean: 56
Group 2 mean: 78
P value: 0.034
Power: 0.8
The relationship is statistically significant