# Psyc312-8

Home > Preview

The flashcards below were created by user ctryhurn on FreezingBlue Flashcards.

1. For which scales can a mean be calculated
• Nominal
• Interval
• Ratio
2. For which scales can a median be calculated
• Ordinal
• Interval
• Ratio
3. For which scales can a mode be calculated?
• Nominal
• Ordinal
• Interval
• Ratio
4. Advantages & Disadvantages of using the mean
• easily manipulated algebraically
• reliable because it takes into account every measure of a data set

greatly affected by extreme scores
• little influence by extreme scores
• reasonable estimate of the center of a distribution

may not be good to ignore extreme values
not influenced by extreme scores

• may not represent the scores
• ignores extreme values completely
7. How to calculate IQR?
• Find the median location (n+1)/2
• Find quartile location (ML+1)/2
• Find Q1 & Q3 (low score + QL; high - QL)
• IQR= distance btwn Q3 - Q1
• Outliers: Q3+ (1.5 x IQR); Q1-(1.5 x IQR)
8. Empirical Rule...
68-95-99.7 within 3 standard deviations of the mean
9. Deviation
the difference btwn each score and the mean of the data set
10. Variance
single number representing the average amount of variation in a data set
11. Standard deviation
Measure of the spread of scores out from the mean of the sample

### Card Set Information

 Author: ctryhurn ID: 25285 Filename: Psyc312-8 Updated: 2010-06-30 13:04:32 Tags: psyc Folders: Description: psyc Show Answers:

Home > Flashcards > Print Preview