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Chapter 2 Notes

by: Taylar Delisle

Chapter 2 Notes APSY210

Taylar Delisle
GPA 3.02

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About this Document

Median, mode, quartiles, std, more
Experimental Statistics
Class Notes
Statistics, Psychology
25 ?




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This 2 page Class Notes was uploaded by Taylar Delisle on Thursday September 15, 2016. The Class Notes belongs to APSY210 at SUNY Albany taught by Dubek in Fall 2016. Since its upload, it has received 3 views. For similar materials see Experimental Statistics in Pscyhology Stats at SUNY Albany.


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Date Created: 09/15/16
  Chapter 2 Notes   ➔  report a measure of ​spr ​ ead along with a measure of ​ce​nter when describing a distribution  numerically  ◆ Spread ­ entire set of numbers  ◆ Center­ how to find it:   ● Mid point on a distribution   ○  Same as identifying its “location” along the Dependent Variable  (x axis)  scale.  ● Also known as t​he m ​ edian (average, middle number)  ○ value with exactly half the data values below it and half above it.  ○  identifying the center of skewed distributions or ordinal variables.    ➔ Range­ maximum number minus minimum number    (max­min)   ◆ Disadvantage: range is a single extreme value can make it very large and, thus,  not representative of the data overall.  ◆ one index of the spread or “dispersion” of a distribution     ➔ Mode­ most common number  ◆ Ex: Mode of 7,8,8,7,3,1,6,9,3,8 = 8    ➔ Mean­ average of all the numbers  ◆ Formula:  ​ ( Σ x​i​ / ​   ◆ Measures the center    ➔  interquartile range (IQR)­ allows mathematician to focus on center of data  ◆ Quartiles­ divide the data into four equal sections.   ● Lower­ 25th percentile and less of all score   ● Higher­ 75th percentile and higher of all scores  ◆ IQR = upper quartile – lower quartile    ➔ Variance:   ◆ Formula: ​ Σ( ​ x­m)^2 all over n   ○  ( ​  ​ Σ​9x­m^2))/n  ◆ a quantity equal to the square of the standard deviation    ➔ Standard Deviation  ◆ Formula      Chapter 2 Notes   ◆ square root of the variance and is measured in the same units as the original  data.   ➔ When telling about a quantitative variable, always report the shape of its distribution,  along with a center and a spread.   ◆  If the shape is skewed, report the median and IQR.   ◆  If the shape is symmetric, report the mean and standard deviation and possibly  the median and IQR as well.    ➔ Box Plot chart:   ◆ a graphical display of the five number summary:  ○ Min, Max, Median, lower quartile, upper quartile  ◆ Useful when comparing groups   


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