Which test deck Flashcards
What is the binomial test/ When is it used?
The binomial test checks whether the observed proportion of successes in your data, of two single categorical variables such as heads/tails, is significantly different from the expected (or hypothesized) proportion.
If the test result is statistically significant, it suggests that the observed proportion is likely different from the expected proportion.
What is Chi-squared ?
A test of difference between categorical variables (Nominal / ordinal)
Unlike binomial tests it isn’t limited to dichotomous variables (success/fail) and can test more than 2 categories
What are paired samples? Example?
It is data across the same group before and after intervention or under two different conditions
Example - Usually tests before and after such as whether nicotine patches help quit smoking, the two variables are the nicotine patches and whether they smoked before the test and if they smoke after.
What is a student t-test?
Difference in means of a group of measures of continuous variables (interval/ratio)
When is the One sample t-test used? Difference to Chi? Example?
When we want to test whether the mean of a single sample of continuous data (Interval/ratio) differs from known/hypothesised mean
It differs from chi-squared as it is not categorical data and measures means rather than frequencies/proportions
Example - Comparing 20 Male student Vo2 max tests to 20 published Vo2 max tests.
When is the Independent/unpaired samples t-test used? Difference to Chi? Example?
Compares the observed difference between the means of two independent groups
It differs as it measuring means not frequencies, of continuous (numeric) data.
Example - Comparing exam marks from Class A and Class B
When is the paired t-test used? Difference to Chi? Example?
Compares the means of two related groups / a group measure on two different occasions and the difference is compared.
Data is continuous, measures means.
Example - Comparing weight of participants before and after lockdown
When is the chi-squared goodness of fit test used? Difference to TOA and Binomial? Example?
When analysing categorical data (nominal/ordinal), With more than 2 levels.
We want to see if observed/hypothesised data frequencies are the same expected.
Instead of finding relationship between two or more categories, binomial can only do 2 not more
Example - Rolling a dice to see if it is fair/even, what numbers they get for n-tosses
When is the chi-squared test of association used? Difference to GOF? Example?
To determine a relationship between 2 or more categorical (ordinal/nominal) variables
Instead of testing to see if observed frequencies match expected
Example - Whether people in the UK in different age groups have different car preferences
Difference between McNemar’s and paired sample t-test?
McNemar’s is categorical and paired sample is continuous
