Stats Ch 1

Front

What is the formula to identify the lower limit for outliers using IQR?

Back

Q1 - 1.5(IQR)

Front

What is a stem-and-leaf plot?

Back

A graphical representation of data where each number is split into a 'stem' (the leading digit) and a 'leaf' (the trailing digit).

Front

In a stem-and-leaf plot, what does the 'stem' represent?

Back

The leading digit(s) of the data values.

Front

In a stem-and-leaf plot, what does the 'leaf' represent?

Back

The trailing digit(s) of the data values.

Front

What is the purpose of using IQR in statistics?

Back

To measure the spread of the middle 50% of the data and identify outliers.

Front

What does Q1 represent in a data set?

Back

The first quartile, which is the median of the lower half of the data.

Front

What does Q3 represent in a data set?

Back

The third quartile, which is the median of the upper half of the data.

Front

How do you calculate the Interquartile Range (IQR)?

Back

IQR = Q3 - Q1.

Front

What is the significance of the median in a data set?

Back

The median is the middle value that separates the higher half from the lower half of the data.

Front

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

Back

Approximately 68%.