Five marbles, standard error, confidence intervals
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ABCDEFGHIJKLMNOPQRSTUVWXYZAAABAC
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Before Data
After Data
Sample means
Class upper limits
Freq beforeFrequency afterRF before
Relative Freq data after
Frequency means
Rel Freq means
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566.820400.200
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5123.440300.1510.25
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554.86201010.520.5
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55580100.0510.25
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56130200.100
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50000
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56Sums:20204
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51
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54Buckets
Before trade data
After trade data
Distribution of sample means
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56200.20
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56400.150.25
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56610.50.5
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54800.050.25
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551300.10
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53
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50
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5123
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514
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575
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554
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5
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4.2
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0.8366600265
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SE0.3741657387
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Before Data
After Data
Sample means
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Sum:100100
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Sample size n:20204
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Average:555
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Standard deviation:03.211821.3952
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Standard error of the mean:
0.71818
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Note that the standard error
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of the mean formula estimates
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based on the data being normally
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distributed
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Sample means should exceed
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30 means before a clear normal
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distribution could be expected to
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be seen.
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