Statistical Analysis

Chapter 0.2

Data

Collected using bar graphs, histograms, scatterplots, qualitative measures, and quantitative measures

Correlation Coefficient

Measures how strong a relationship between two variables is; ranges from 1-10

Positive Correlations

Those above 0

Negative Correlations

Those below 0

Positive Skew

Where the bulk of information on the graph is skewed right

Negative Skew

Where the bulk of information on the graph is skewed left

Bimodal Frequency Distribution

A dataset that contains two peaks

Central Tendencies

Central or typical value for a probability distribution

Mode

Most frequently occuring score

Mean

The average score

Median

The middle score (half above, half below)

Range

Difference between the highest and lowest scores

Percentile

Indicates the value below which a given % of observations in a group of observations fall

Standard Deviation

The amount of variation / dispersion in a set of values, indicating how spread out the values are around them

Correlation Coefficient

Describes the strength and direction of the relationship between two variables

Peer Review

Work is evaluated by other experts in the field

Replication

Process of repeating a study under the same conditions