Unit 1 - Extra bits Flashcards
What is Standard form?
Another name for scientific notation, which is a way of writing very large or small numbers using a number between 1 and 10 multiplied by a power of 10
What are descriptive statistics?
Ways of summing up and presenting your findings
What are inferential statistics?
Working out what your findings are telling you (statistical tests).
They enable you to work out which hypothesis has been supported by the data
What type of data are pie charts good for?
Nominal, enabling the researcher to present percentages from within an overall total and show proportions of a whole.
Why are line graphs good?
They are useful for showing change over time
Psychologists may use to to track behaviour or attitudes over time
What is the difference between a bar chart and a histogram?
bar charts convey information about frequencies through the height of the bars, whereas histograms convey this through the area.
archarts also have spaces where histograms don’t, and show discrete data while histograms show continuous data.
What are the 5 non-parametric inferential tests?
Binomial sign tests, Chi square, Wilcoxon signed ranks test, Mann-Whitney U test and Spearman’s Rho
When would you use Chi Squared?
With nominal data and independent measures design
When would you use Mann-Whitney U test?
With Ordinal data and repeated measure
When would you use a Binomial sign test?
With nominal data and repeated measures
When would you use Wilcoxon signed ranks test?
Ordinal data and repeated measures
What test non-parametric test would you use for correlation?
Spearman’s Rho
What are the three criteria for using a parametric inferential statistical test?
The data has to be interval or ratio
The data has to have a curve of normal distribution
The variances should be similar
What does P>0.05 mean?
The chance that the results are due to chance is greater than 5%, so the null hypothesis would be accepted
What is a type 1 error?
When the alternative hypothesis is mistakenly accepted, suggesting that there is a statistically significant result when in reality it is just down to chance