{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Session__2_notes

# Session__2_notes - Session 1 Review Be able to define...

This preview shows pages 1–10. Sign up to view the full content.

Session 1 Review: Be able to define: population vs. sample, statistic vs. parameter, descriptive vs. inferential statistics, discrete vs. continuous, qualitative vs. quantitative Be able to define and categorize variables into measurement scales (nominal, ordinal, interval, ratio) Be able to read and interpolate information from a frequency distribution, frequency polygon, and boxplot Be able to identify and describe a distribution (i.e. skewness, unimodal vs. bimodal, normal, symmetric, etc Be able to estimate or calculate a percentile rank using appropriate formulae or graphical displays (ogive curve)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Vocabulary: Construct – a concept inferred from commonalities among observed phenomena (i.e. intelligence) Variable – Nonuniform characteristics of observational units (i.e. IQ) Measurement – An observation that is expressed as a number (i.e. IQ score)
Nominal measurement groups objects into classes or categories . Ordinal scales are used to rank a group of things from high to low. Interval scales include variables in which the magnitude of differences among the units is defined by the numbers, but there is no absolute zero . ( equal intervals ) Ratio measures have an absolute zero , which denotes an absence of the property.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Stem-and-leaf displays are similar to grouped frequency distribution. Example: 220, 221, 224, 233, 233, 234, 235, 240, 241, 264 Stem Leaf 22 23 24 25 26
Stem-and-Leaf Plot in SPSS CHOLESTEROL LEVEL (MG/DL) Stem-and-Leaf Plot Frequency Stem & Leaf 1.00 1 . 3 2.00 1 . 55 9.00 1 . 677777777 7.00 1 . 8889999 12.00 2 . 000001111111 12.00 2 . 222222333333 27.00 2 . 444444444445555555555555555 35.00 2 . 66666666666666666667777777777777777 19.00 2 . 8888888888899999999 18.00 3 . 000000011111111111 17.00 3 . 22222223333333333 16.00 3 . 4444444445555555 9.00 3 . 666666777 7.00 3 . 8888999 3.00 4 . 001 3.00 4 . 222 1.00 4 . 5 2.00 Extremes (>=474) Stem width: 100 Each leaf: 1 case(s)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
A cumulative percentile is the percentage of the distribution that falls within each interval plus the percent falling below the interval.
1. Rank the scores from low to high Low = 1 ( i = 1) to High = n ( i = n) 3. PR = percentile rank of score 4. R i = rank of the score in question 5. n = number of scores or ranks ( 29 n R PR i i 5 . 100 + = Calculating a percentile rank

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
In mathematical expressions, the standard order of operations is: Parentheses and other grouping symbols Exponents (powers) Multiplication and division Addition and subtraction To help you remember : PLEASE EXCUSE MY DEAR AUNT SALLY Order of operations
Allie took a test with 49 other people, so 50 people in total took the test.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 48

Session__2_notes - Session 1 Review Be able to define...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online