One Variable Statistics Review A

Front

What is the definition of median in a data set?

Back

The median is the middle value of a data set when the numbers are arranged in order.

Front

How do you find the upper quartile (Q3) of a data set?

Back

To find Q3, arrange the data in ascending order and find the median of the upper half of the data.

Front

What is the definition of mean?

Back

The mean is the average of a data set, calculated by adding all the values and dividing by the number of values.

Front

What does it mean if the mean is greater than the median in a data set?

Back

It indicates that the data set is positively skewed, meaning there are higher values that pull the mean up.

Front

How do you calculate the median of an odd set of numbers?

Back

For an odd set, the median is the middle number when the numbers are arranged in order.

Front

How do you calculate the median of an even set of numbers?

Back

For an even set, the median is the average of the two middle numbers when the numbers are arranged in order.

Front

What is a data set?

Back

A data set is a collection of related values or observations.

Front

What is the purpose of using quartiles in statistics?

Back

Quartiles divide a data set into four equal parts, helping to understand the distribution of the data.

Front

What is the lower quartile (Q1)?

Back

Q1 is the median of the lower half of a data set, representing the 25th percentile.

Front

What is the interquartile range (IQR)?

Back

The IQR is the difference between the upper quartile (Q3) and the lower quartile (Q1), indicating the spread of the middle 50% of the data.