# Research Methods Flashcards

correlation

a measure of how strongly 2 or more variables are related to each other

is correlation more ethical

yes because nothing is manipulated

positive correlation

as one variable increases, so does the other

negative correlation

as one variable increases the other decreases

correlation coefficient

measures the strength of relationship between -1 and +1

2 types of hypothesis

null

alternate (one or two-tailed)

two-tailed hypothesis

“there is a correlation between”

either positive or negative correlation

one-tailed hypothesis

“there is a positive correlation” or “there is a negative correlation”

null hypothesis

“there is no correlation between”

nominal data

data put into named categories

ordinal data

data put into rank order from lowest to highest

interval data

data is taken using the same unit of measure throughout the range

discrete data

data that can only take a certain individual value

continuous data

data that can have any number value in a certain range

assumptions of parametric tests

populations drawn from should be normally distributed, variances of populations should be equal, at least interval/ratio data, no extreme scores

why non-parametric tests are used

when assumptions of parametric tests can’t be fulfilled, when distributions are non-normal

independent variable

the factor you change

dependent variable

the result when affected by the independent variable

experiments designs

independent groups, repeated measures, matched groups, quasi

independent groups

when there are groups of different participants being tested by the same test

repeated measures

the groups of participants are the same but given different tests