Dependent Variable

Independent Variable

Squaring a Decimal

Square Root of Decimal

Relationships in Equations

A = B/C

Relationships in Equations

A = B*(1-C)

Types of Data

Interval Data

Ratio Data

Nominal Data

Ordinal Data

Descriptive Statistics

Descriptive Stats of
GROUP AS A WHOLE

--3 fundamental parts--

measures of central tendency

Mean (measure of central tendency)

Median (measure of central tendency)

Mode (measure of central tendency)

measure of variability

Standard Deviation (measure of variance)

Variance (measure of variability)

Range (measure of variability)

Graphing NOMINAL or ORDINAL Data

Exception to Bar Graphs

Graphing INTERVAL or RATIO data

Normal Distribution

Skewed Distribution

Positive Skew

Negative Skew

Effects of Skew on Central Tendency

Central Tendency Values with POSITIVE skew

Central Tendency Values with NEGATIVE Skew

Highest Value (measure of central tendency) with POSITIVE skew

Highest Value (measure of central tendency) with NEGATIVE skew

Raw Score

Percentile Rank

Standard Scores

z-score

T-scores

3 standard values in bell shaped curve

Percentile Ranks on a Bell Curve

Changing Percentile Ranks