Statistical tests Flashcards
What it the table used to choose a statistical test?
————-Related———–Independent—–Association
Nominal-Sign test——–Chi-squared—–Chi-squared
Ordinal—Wilcoxon——-Mann-Whitney–Spearmans rho
Interval—Related t-test-Unrelated t-test–Pearsons r
How do you carry out the sign test?
Calculate the value of S by counting the least frequent number of signs. The N value is the number of participants, ignoring any people who got the same results both times. The value of S is significant if when compared to the critical value, it is less than or equal to.
How do you use Chi-squared?
To find the critical value, you need to work out the df by calculating (rows-1)x(columns-1). The calculated value is significant if it is more than or equal to the critical value.
How do you use Wilcoxon?
To find the critical value, you need to know the value of N which is the number of participants, ignoring any people who got the same results both times. The calculated value is significant if it is less than or equal to the critical value.
How do you use Mann-Whitney?
To find the critical value, you need to know how many people are in group a and group b and use them to read off of the table. The calculated value is significant if it is less than or equal to the critical value.
How do you use Spearmans rho?
To find the critical value, you need to know the value of N which is the number of participants. The calculated value is significant if it is more than or equal to the critical value.
How do you use Related t-test?
To find the critical value, you need to know the value of N, which is the number of participants -1. The calculated value is significant if it is more than or equal to the critical value.
How do you use Unrelated t-test?
To find the critical value, you need to know the value of df, which is the number of participants in both groups -2. The calculated value is significant if it is more than or equal to the critical value.
How do you use Pearsons r?
To find the critical value, you need to know the value of N, which is the number of participants -2. The calculated value is significant if it is more than or equal to the critical value.
What is nominal data?
Data in categories, such as your favourite football team.
What is ordinal data?
Data that is ordered, for example rating enjoyment from 1-10.
What is interval data?
Data that is based on scales with equal units, such as time.
