2014.3.10* Medical Statistics Tao
Yuchun4http://cc.jlu.edu.cn/ms.html
TYC
2014.3.10* Normal Distribution and Reference Range 1. Normal
Distribution
TYC
2014.3.10*1.1 Normal Distribution See the histogram of
Example1-1.
TYC
Chart1
3.6~
3
3
8
23
24
25
20
12
10
4
Blood sugar (mmol/L)
Frequency
Fig.1-1 histogram based on the data of blood sugar of 132 normal
adults
tab8-1
3.60~32.272.27
3.80~32.274.55
4.00~86.0610.61
4.20~2317.4228.03
4.40~2418.1846.21
4.60~2518.9465.15
4.80~2015.1580.30
5.00~129.0989.39
5.20~107.5896.97
5.40~5.6043.03100.00
132100.00
fig1-1
3.6~
3.8~3
4.0~3
4.2~8
4.4~23
4.6~24
4.8~25
5.0~20
5.2~12
5.4~103.60~
5.643.80~
4.00~
4.20~
4.40~
4.60~
4.80~
5.00~
5.20~
5.40~5.60
fig1-1
Blood sugar (mmol/L)
Frequency
Fig.1-1 histogram based on the data of blood sugar of 132 normal
adults
2014.3.10*n inc.n n is increasing; the number of sub-intervals
is increasing;A characteristic shape likened to that of an upside
down bell - Normal Distribution CurveWhenWhat will happen ?
