Convenience Simple random sample is the

For data having a Normal Distribution, which we will examine in great detail later:

• Approximately 68% of the data is within one standard deviation of the mean.

• Approximately 95% of the data is within two standard deviations of the mean.

• More than 99% of the data is within three standard deviations of the mean.

• This is known as the Empirical Rule.

38. Coefficient of Variation is-

n. To adjust for the scale of the underlying data the Coefficient of Variation (CV)


has been developed. Mathematically:


CV =s /x*100conditioned upon x


¯

32. the distribution of data is skewed to the right

≠ 0, where s is the standard deviation of the data and x


¯


Is the mean.

39. Midpoint-

the mean of an interval in a frequency table

40. Mode is -

The value that appears most frequently in a set of data

41. Percentile is -

A number that divides ordered data into hundredths; percentiles may or may not be part of the data. The