Inferential statistics Flashcards
What does the abbreviation P stand for
Probability
Inferential tests draw inferences from ?
A research sample to the population
Data that are measured using units of equal measurements are
Interval data
The test statistic calculated for Wilcoxon’s test is
T
The abbreviations dF stands for
Degrees of freedom
Generally the abbreviations dF is equivalent to
Number of participants in a study
The significance level most commonly used in psychology is what percent
5%
A type II error occurs when 17
The alternate hypothesis is wrong
A type I error is a
False positive
How else might you write a 5%
0.05
Data that are in categories are called
Nominal data
Data from a rating scale are strictly speaking are
Ordinal data
A type II error is more likely to happen when the required significance level is
Too high
What would be the appropriate test to select interview conducted a study with ordinal data and requiring a correlational analysis
Spearmen’s rank order correlation test
What would be the appropriate tested to select if you conducted an experiment with a repeated measures design and ordinal level data 19
Wilcoxon T test
what are inferential statistics based on?
probability
what is a chi squared test
we use this test when we we have counted how many occurences there are in each category …called frequency data. This test can be used to investigate a difference or an association
what is the mann whitney U test
this is a test of difference to be used when there are independent groups i.e. where a study involves two groups of participants and each group is given a different level of the independent variable
the sign test
this is another test of difference - this is used when analysing nominal data collected in a study with a repeated measures design
What are nominal data
Data in separate categories such as grouping people in your class according to their height. Within each category we have a count of how many people are items are in that category. This is frequency data
What are ordinal data
Data are ordered in some way for example each person in your class lines up in order of size the difference between each person is not the same. Data that are ranked are ordinal measurements the intervals between first second third example are equal but each rank represent items which are not equally separate
What are interval and ratio data
Data are measured using units of equal intervals such as measuring everyone’s height in centimetres such units of measurement have equal intervals therefore the level of measurement is more precise. A ratio scale has a true zero whereas an interval scale does not. For example the Celsius temperature scale doesn’t have a true zero
What is an acronym to help remember the four levels of measurement of data
noir
