Research Aptitude
2.31
means there is a very small but non-zero probability
of extreme values (far from the mean) occurring.
5.
Empirical Rule:
This is known as ‘68-95-99.7 to recall
easily.
•
Approximately 68.27% of data falls within one
standard deviation of mean.
•
About 95.45% of data falls within two standard
deviations of mean.
•
Nearly 99.73% of data falls within three standard
deviations of mean.
Finally, in practice, data is not always normally distrib-
uted. However, researchers often try to approximate a
normal distribution in their data analysis. This is because
the normal distribution is a useful tool for correcting ...
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