Percentiles (midterm review)

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

What percentage of data falls within one standard deviation of the mean in a normal distribution?

Back

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

Front

What percentage of data falls between the first and third quartiles?

Back

50% of the data falls between the first (25th percentile) and third quartiles (75th percentile).

Front

What is the 25th percentile also known as?

Back

The 25th percentile is also known as the first quartile.

Front

What is the 50th percentile also known as?

Back

The 50th percentile is also known as the median.

Front

What is the 75th percentile also known as?

Back

The 75th percentile is also known as the third quartile.

Front

What is relative frequency?

Back

Relative frequency is the frequency of a specific data value divided by the total number of data values in the set.

Front

What is the formula for calculating percentiles?

Back

Percentile = (Number of values below the score / Total number of values) x 100.

Front

What does the interquartile range (IQR) represent?

Back

The interquartile range (IQR) represents the range of the middle 50% of the data, calculated as Q3 - Q1.

Front

What is the significance of the 95th percentile?

Back

The 95th percentile indicates that 95% of the data points fall below this value.