Week 3 - Your 1st Analysis Method: Chi-Square

Question 1

How are probability and chi-squared related in a chi-square analysis?

Answer 1

As the chi-square increases, p (probability) decreases.

Question 2

Why is 3.84 an important value of chi-square?

Answer 2

It is the threshold (‘critical value’ for significance when degrees of freedom = 1

Question 3

What is the correct APA format used when chi-square value is 0.01 and there are 5 degrees of freedom

Answer 3

χ2 (5) = 0.01

Question 4

What data can you analyse with a chi-square test?

Answer 4

Categorical

Question 5

Definition of null hypothesis:

Answer 5

Null hypothesis A statement that there is no effect or difference, used as a starting point in hypothesis testing.

Question 6

Definition of deviation

Answer 6

The difference between the actual observed values and what is expected under the null hypothesis

Question 7

Definition of statistical significance

Answer 7

The likelihood that a result is not due to chance,
often assessed using a p-value

Question 8

Definition of critical value

Answer 8

The threshold value the test statistic must exceed to reject the null hypothesis

Question 9

Definition of degrees of freedom

Answer 9

The number of independent values that can vary in an analysis, affecting the shape of the statistical distribution

Question 10

What is the difference between one variable and two variable chi-square?

Answer 10

• One-Variable also known as ‘‘A Goodness of fit test’’ can tell us whether there are ‘significantly’ more Philips than Jacks in Philadelphia compared to what we would expect
• Two-Variable also known as ‘‘The Test of Association) can tell us whether there is a relationship between our two variables.