Unit 1 - Day 4 (Statistics) Flashcards
What is qualitative data?
- Largely non-numerical
- Structured interviews, focus groups, and narratives.
- Allows you to capture complex experiences numerical analysis can’t.
What is quantitative data?
- Numerical data gathered through surveys, correlations, and experiments.
- Example–a questionnaire using a likert scale (0-5 rating)
What is descriptive statistics?
Deals with quantitative data. Numerical data used to measure and describe characteristics of groups. Includes measures of central tendency and variation.
What are measures of central tendency?
A single score that represents a whole set of scores telling us how most people generally scored (mean, median, mode)
What is mean?
The arithmetic average of a distribution (add scores and divide by total number) and most commonly used measure because it is the most sensitive.
What is sensitivity of the mean?
Sensitivity of the mean can cause a problem if there is one or two extreme outlying scores. This causes skew and makes the mean misleading.
What is the median?
The middle score in distribution; half scores above and half below (50th percentile). When there is skew, the median becomes as important as the mean.
What is mode?
Most frequently occurring score(s). in a distribution.
What does bi-modal or multi-modal mean?
The set of data has two modes.
What is regression toward the mean?
The tendency for extremely high or low scores to become moderate (closer to the mean) upon retesting over time.
What does a normal or bell-shaped curve mean?
Occurs when the mean, median, and mode are all the same.
What is skewed distribution?
Representation of scores that lack symmetry around the average value. Skew is based on the direction the curve tip points.