Stats T3 Flashcards
Do scores for one variable correlate with scores for the other variable?
Statement about association
How strong is the correlation or association between two variables?
Statement about association
Do I trust that there is a “genuine” association (relationship)?
Statement about relationship between two variables
null hypothesis
states the contrary of the experimental or alternative hypothesis
A linear correlation describes
Two variables that are either proportionate or anti proportionate
Correlation coefficient
A number also represented by “r” describes positive (r=1), negative (r=-1) or no correlation (0=r)
Operational Definition
procedure for indirectly measuring and defining a variable that cannot
be observed or measured directly. An operational definition specifies a measurement procedure (a set of operations) for measuring an external, observable behaviour and uses the resulting measurements as a
definition and a measurement of the hypothetical construct.
operational definition
defining a variable in terms of the set of steps or procedures that the researcher goes through in order to manipulate or measure the variable
Sampling variability
differences in or across samples due to random things happening
What are two ways to visually represent to measurement data variables?
- scatter plots 2. contingency tables/crosstabulation
How should the strength of a correlation be interpreted?
- Perfect:(-) 1/1 * Strong:(-) 09-07 * Moderate:(-).6-.4 * Weak: (-). 3-.1 * None:0
Which visual representation should you choose if you want to show that variables vary simuntaneously?
scatter-plots
The p-value can be defined as
the probability of obtaining a significant result when the null hypothesis is true
