# NUR 80A/B Lecture Notes - Lecture 4: Standard Deviation, Level Of Measurement, Descriptive Statistics

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9 Feb 2016
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  
RESEARCH Week 4 NOTES-DESCRIPTIVE STATISTICS
Descriptive Statistics



 
REQUIRED READINGS / MATERIALS
!"#\$%&' (& "\$)\$*
#\$%&' &\$&+&,- .-
/ 
Review from last Week
0123
o415,55#256
2225%
o2))
'))
o/7
o87
\$'-!9: 52;;
<62
81=
DESCRIPTIVE STATISTICS: WHAT IS IT?
->
o0
o?
o45?
o05
<& 5&5?5& 5
2#%
Univariate statistics
o2"" 
o"5"&&2&2&2&"
2
o&6#)% 
o
2225 
o232
2
Bivariate statistics
o6(@
o\$2
o2\$22)2
WAYS TO DESCRIBE DATA
A set of data can be completely described in terms of:
" 
\$" 
+" 
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  \$
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MEASURES OF CENTRAL TENDENCY
22
5
52 
 222.2
2
5
-5
o
o
o
o A 2
MODE
2
25 
 2 5""Nominal# 
5&2& %
-ordinal, interval,  ratio
22 6722
o)2#62%
most frequently occurring score or category
*\$+\$*B\$\$\$B\$+\$+C\$\$\$+\$(
o7\$+
42
MEDIAN
represents the exact middle score
.
66(D
A.2
66
6&&
DETERMINING THE MEDIAN
SCORES ON A QUESTIONNAIRE
*\$+\$*B\$\$\$B\$+\$+C\$\$\$+\$(
o555
o25#6E%
o86F&562"

6G
oB*C\$\$\$\$\$+\$+\$+\$+\$""
MEAN
22
o25F2
-H-
22
5
&I2
2 &@
o.2
 2 
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#2%
2M025GN
 G66"
WHEN TO USE WHAT
0 22
o6&you must decide what is the most appropriate measure
2
Mode62
Median 636.2
Mean 6.2
LET’S CHECK
-62 )  ="<65
 22  "
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26 6G
7\$
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BC12\$\$+\$
+(9225
*B++925
9
-+27\$
2
<)
MEASURES OF VARIABILITY
2625 A22#5%
M NM N
5&5
VARIABILITY
56  
o257
o5725
HOW DISTRIBUTIONS CAN DIFFER IN VARIABILITY
TWO DISTRIBUTIONS OF DIFFERENT
VARIABILITY
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