module - 2 sampling
TRANSCRIPT
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Fig. 11.1
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.
,, , .
, .., .
, , .
. .
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Table 11.2
Type of Study Minimum Size Typical Range
(..
)
,,
(.. )
, , (
)
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Fig. 11.2
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. ,
.
,
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.
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. , ,
.
, .
48 48 480 52 52 520
100 100 1000
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, , .
,
.
.
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()
.
.
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, .
.
.
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Cluster Sampling
Stratified Sampling
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, .
, .
., .
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Fig. 11.3
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.
Example: we want toestimate the average weight ina population, and we want theerror of estimation to be less
= (/2)
2
2 / 2
:
: (
)./2:
.
an g o e rue mean,with a probability of 95% (e.g.,error rate of 5%).
N= (1.96)
2
2
/ 2
2
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() 10 96
300
400
14 18816 24618 311
20 384 0
100
200
10 12 14 16 18 20
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. .
Example: The proportion ofpreference for product A isaround 80%. We want toestimate the reference in a
= (/2)
2(1) / 2
: .
: (
)./2:
.
community within 5% with95% confidence interval.
N= (1.96)2 (0.8)(0.2) /
0.052 = 246 consumers.
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.
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( # ).
: ().
, . ,
, .
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.
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,
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,
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2/18/2010 Sample Size Determination and Errors 24