Chi squared

Question 1

what are descriptive stats

Answer 1

describes and summarises a set of data

• measures of central tendency
• measures if dispersion

Question 2

what are inferential stats

Answer 2

helps predict the population characteristics from the sample characteristics

• estimating population parameters
• hypothesis testing

Question 3

what is hypothesis testing

Answer 3

statistical tests help us to understand the probability of obtaining a result as extreme as the observed value if the null hypothesis were true

if this probability is low, we reject the null hypothesis in favour of the alternative hypothesis

Question 4

how to know which statistical test to use?

Answer 4

Carrots Should Come Mashed With Swede Under Roast Potatoes

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Question 5

what is the McNemar test

Answer 5

used when we have paired nominal data

we have two sets of frequency data for our participants

this is carried out in a similar way to chi-squared, but using a different approach to the null hypothesis

Question 6

what is chi squared?

Answer 6

tests whether the frequency counts in the various nominal categories could be expected by chance or whether there is a relationship.