Unit 3 - RM: Processing and Evaluating 2016 Flashcards
(27 cards)
What are the three ways quantitative data can be displayed?
- tables
- graphs
- diagrams
What are the different types of graphs?
- histograms
- bar graphs
- line graphs
- scatterplots
- frequency polygon
What are the four measures of central tendency?
- mean
- median
- mode
- range
What does mode mean?
Mode of the most frequently occurring number in a data set.
What does median mean?
The median is the middle number of the data set.
What is the mean?
The average number of the data set.
What is the range?
The lowest number in the data set subtracted by the highest number of the same data set.
What are the three measures of dispersion?
- bell curve/normal curve
- variance
- standard deviation
Explain using words, what a low variance bell curve looks like.
Little spread of scores from the mean or mid point.
Explain using words, what a high variance bell curve looks like.
The bell curve has a lot of spread in the scores from the mean or mid point.
What does it mean by a positive skew?
More low than high scores in the data set.
What does it mean by a negative skew?
More high than low scores in the data set.
What is bi-modal distribution?
Scores are distributed around two different mid points in the data set.
What is the definition of the p-value?
The level of probability that the results are due to chance alone.
What does p
- results are statistically significant
- hypothesis is accepted
- results are likely to be due to the IV
What does p>0.05 mean?
- results are not statistically significant
- hypothesis is rejected
- results are likely to be due to chance
What are the three types of correlational studies?
- naturalistic observation
- the survey method
- archival research
What is a positive correlation?
When both variables increase or decrease in relation to each other.
What is a negative correlation?
When one variable increases the other decreases, or vice versa.
What is a strong correlation?
When the points (dots) are close to forming or are tightly bunched together.
What is a weak correlation?
When the points (dots) are shown being further apart.
What is naturalistic observation?
When an individual observes another individual or a group of people in a natural environment with no interference and recording observations about behaviours they witness.
What is archival research?
Analysing studies conducted by other researchers or by looking at historical patient records.
Ms Overend wants to test the effects of caffeine on studying habits. To do this, she designs an experiment with an independent group design, with a sample size of 12 students. Identify a source of error in her experiment.
The sample size was too small to analyse the effects.
