1. IB Psychology 12.08 .16 Today’s Agenda: Turn in: Work Day… Take out:
Nothing
Take out:
Notes, notes, notes
Today’s Learning Objectives:
I can write an impactful introduction in order to successfully preface my Internal Assessment.
Today’s Agenda:
Work Day…
More Internal Assessment!
More Statistics & Such…
HW:
Results due Friday by EOC

2. LOOK AT THE EXAMPLES ON MY WEBSITE…
Best advice:
LOOK AT THE EXAMPLES ON MY WEBSITE…
and seek some others more specific to your study…
We might even score them together…

3. Discreet vs. Continuous Data
Discreet: Cannot be divided…only occurs in certain values (a guitar, a correct answer, school attended, yes/no, etc.)
Continuous: can be divided infinitely, has no other distinct value (best example: TIME)
You can usually tell the difference between discrete and continuous data because: Discreet is typically COUNTED
Continuous is typically MEASURED

4. Levels of Measurement
Nominal—sounds like “Name” non-numeric, or numbers can be ordered in any fashion…discreet data
Ex: Students that ate breakfast, jersey numbers on athletes, gender, race, etc.
Ordinal—sounds like “Order” the order matters but the differences do not matter
Ex: Grades—we know an “A” is better than “D” but do we really know how much better? Rating Scales, order of finishing a race, etc.
Interval—The distance between two things: the order and differences between levels of a variable matter, but they are not in a ratio
Ex: temperature, time, etc.
Ratio—the numbers tell us how much of one thing we have in comparison to another thing.
Ex: a score of 75% compared to 50%, Three times as fast, etc.

5. Descriptive Statistics:
Summarizing Data:
Central Tendency (or Groups’ “Middle Values”)
Mean
Median
Mode
Variation (or Summary of Differences Within Groups)
Range
Interquartile Range
Variance
Standard Deviation
Calculate ALL, Pick ONE: be able to justify your use of the central tendency…
Calculate ALL (?), Pick ONE: be able to justify your use of the variation…
Most likely…

6. Descriptive Statistics:
Which should you use???
Calculate ALL, Pick ONE: be able to justify your use of the central tendency…
Calculate ALL (?), Pick ONE: be able to justify your use of the variation…SD most likely

7. Formula for “Standard Deviation of a Sample”