Research Methods Flashcards
(237 cards)
What is an aim:
A statement of the study’s purpose. Research should state its aim beforehand so it is clear what the study intends to investigate.
What is a one-tailed (directional) hypothesis
A hypothesis that predicts a difference between your variables. It makes a directional prediction. (Higher, slower, faster, slower)
Give an example of a one tailed (directional) hypothesis
Redbull drinkers more alert than normal people
When would you use a one tailed hypothesis for
When there is already existing research that supports our aim and tells us which way the results will go
What is a two-tailed (non-directional) hypothesis
A hypothesis that predicts a difference but doesn’t state where the difference lies.
Give an example of a two tailed hypothesis
Difference between memory between choclate eaters and non-chocolate eaters
What could you use a two tailed hypothesis for
In order to find out the effect of something that hasn’t been tested yet or when the results are mixed or inconclusive.
What is a null hypothesis
This is what you assume is true during the study. Any data you collect will either back this assumption or it won’t. If the data doesn’t support your null hypothesis, you reject it and go with your alternative hypothesis instead.
The null hypothesis will predict that there is no difference between your variables
Given an example of a null hypothesis
There will be no difference between psychology students at RC and HX, when completing a memory task.
What is a bar chart
Used to present non-continuous data (e.g categories)
It is used for discrete data (data that falls into separate categories)
Give an example of categories on a bar chart
E.g blood type, form of transport to school, type of favourite ice cream
How is a bar chart different to a histogram
The columns do not touch
What is a histogram
Used when you have continuous data- the columns touch and it is the height of the column (y-axis) that shows the frequency of the values in each interval (on the X-axis)
What is correlation analysis
It is a measure of how closely two or more variables (co-variables) are related.
Advantages of correlation analysis
• Do not need to use a controlled experiment
• Can use sensitive data obtained from hospitals
Can be used when it would be unethical/ impractical to conduct an experiment
If correlation is significant, then further investigation is justified
If correlation is not significant, you can rule out a casual relationship
Disadvantages of correlation analysis
• Cannot establish cause and effect – third variable
• Coefficients can be due to chance- There may be other unknown variables that can explain why the co-variables being studied are linked. Additionally, extraneous variables may lead to false conclusions
What is a line graph
Less common but can be used as an alternative to a histogram. The line show where mid-points of each column on a histogram would reach. Particularly useful for comparing two or more conditions simultaneously. Sometimes presented on a histogram.
What is an example of a line graph
Pro-social behaviors in behavioral observations.
What are the three types of correlation
Positive, negative and none
What is the correlation coefficient
Is a number between -1 and +1= the closer it is to +1/-1 the stronger the relationship between the co- variables.
0 is neutral = zero correlation
What is a positive correlation
As one variable increases, the other increases or both decrease
What is a negative correlation
As one variable increases, the other decreases
What is no correlation
When there is no relationship between variables
What is a normal distributions curve (in terms of mean,median and mode)
symmetrical around the mean- mean, mode and median are the same