Week 3 - Content Flashcards
(21 cards)
Why are tables a useful way to display data?
Data is easy to interpret and analyse.
What is the purpose of graphs in scientific reports?
Show a visualisation of data, allow reader to see and determine trends.
Define population
Complete set of all events
Define sample
A group taken from the population
What is systematic sampling?
Researchers select individuals from a population at regular intervals.
What is convenience sampling?
Researchers selects individuals because they are easier for researcher to assess.
What is random sampling?
Individuals are selected from a population randomly.
What is stratified random sampling?
The population is sorted into homogenous groups which individuals are then randomly selected from.
What factors does sample size depend on?
characteristics of investigation, degree of accuracy required, context on which sample is drawn
What is dispersion?
How variable or spread out the data is.
What is the mode?
The most frequent score in a distribution
What is the median?
The middle most score in the distribution
What is the mean/average?
The sum of all scores divided by the number of scores
What is the range?
The highest score in the distribution - the lowest score of the distribution
What does the coefficient of determination (R2) tell you?
How close the statistical model predicts the outcome
What does the correlation coefficient (r) tell you?
Quantitive strength and direction of correlation between variables, give information on how much variation on Y is due to variations in X, aloes range form -1 to 1.
Define aim
What you are trying to do
Define hypothesis
A preposition for an investigation/study based on reasoned evidence, needs to be a statement that can be rejected or accepted.
What is the null hypothesis?
There is no significant difference between specified populations, any observed difference being due to sampling or experimental error
What is the alternative hypothesis
Is an opposing theory to the null hypothesis
What are the conventions used in formatting tables for research papers?
Have titles and footnotes. Come back to this card!
