Percentile and Cumulative Relative Frequency Graphs

Front

What is a percentile?

Back

A percentile is a measure used in statistics indicating the value below which a given percentage of observations in a group of observations falls.

Front

How do you calculate the percentile rank of a data value?

Back

Percentile rank = (Number of values below the data value / Total number of values) x 100.

Front

What is the median?

Back

The median is the middle value of a data set when it is ordered from least to greatest.

Front

How do you find the median in an even set of numbers?

Back

For an even set, the median is the average of the two middle numbers.

Front

What is cumulative relative frequency?

Back

Cumulative relative frequency is the sum of the relative frequencies for all values up to a certain point in a data set.

Front

What is the interquartile range (IQR)?

Back

The IQR is the difference between the first quartile (Q1) and the third quartile (Q3) in a data set, representing the middle 50% of the data.

Front

How do you calculate the interquartile range?

Back

IQR = Q3 - Q1.

Front

What does a cumulative frequency graph represent?

Back

A cumulative frequency graph shows the cumulative frequency of data points as they accumulate, helping to visualize the distribution of data.

Front

What is relative frequency?

Back

Relative frequency is the ratio of the number of times a value occurs to the total number of observations.

Front

How do you convert relative frequency to a percentage?

Back

Relative frequency (%) = (Relative frequency / Total observations) x 100.