Week 3 - Descriptive stats & intro to stat models Flashcards
t-test compares the means of three groups. TRUE or FALSE?
False.
t- test is a statistical test that is used to compare the means of two groups. It is often used in hypothesis testing to determine whether a process or treatment actually has an effect on the population of interest, or whether two groups are different from one another.
An ANOVA or post-hoc test is used when comparing more than two groups (multiple)
TRUE or FALSE
True.
a t-test is a parametric test.
TRUE or FALSE
True.
The t test is a parametric test of difference, meaning that it makes the same assumptions about your data as other parametric tests.
The ___ test assumes your data:
are independent
are (approximately) normally distributed
have a similar amount of variance within each group being compared (a.k.a. homogeneity of variance)
t-test
a Wilcoxon test is for ______ data
non parametric
_______ of _______ is related to your sample size, and shows how many ‘free’ data points are available in your test for making comparisons. The greater the degrees of freedom, the better your statistical test will work.
degrees of freedom
The p value: 2.2e-16 (i.e. 2.2 with 15 zeros in front). This describes the probability that you would see a t value as large as this one by chance.
TRUE or FALSE
True
What is a null hypothesis
A null hypothesis is a claim that there is no relationship between two sets of data or variables being analyzed.
What cant we do with statistics
Neutrality
Samples in psychological research are typically…
biased
We may be able to infer causality if…
We employ an experimental design
Qualitative designs use…
Descriptive representations of information
Integer data are characterised by…
whole numbers
A variable is also known as a…
Factor
There are four possible features of variables. They are…
Identity, magnitude, equal intervals, absolute zero.
