Data & Statistics Retest

Front

What is the definition of Mean in statistics?

Back

The Mean, or Average, is calculated by adding all the numbers in a data set and dividing by the total count of numbers.

Front

How do you find the Median of a data set?

Back

To find the Median, arrange the numbers in order and identify the middle value. If there is an even number of values, average the two middle numbers.

Front

What is a Quartile in statistics?

Back

A Quartile is a type of quantile that divides a data set into four equal parts. The first quartile (Q1) is the median of the lower half, the second quartile (Q2) is the median, and the third quartile (Q3) is the median of the upper half.

Front

What is the Interquartile Range (IQR)?

Back

The Interquartile Range (IQR) is the difference between the third quartile (Q3) and the first quartile (Q1). It measures the spread of the middle 50% of the data.

Front

How do you calculate the percentage of a group?

Back

To calculate the percentage, divide the part by the whole and multiply by 100.

Front

What is a Box Plot?

Back

A Box Plot is a graphical representation of a data set that shows the median, quartiles, and potential outliers.

Front

What does it mean if a data set is skewed?

Back

A data set is skewed if it is not symmetrical, meaning one tail is longer or fatter than the other. Right skewed has a longer right tail, and left skewed has a longer left tail.

Front

What is the difference between a population and a sample?

Back

A population includes all members of a specified group, while a sample is a subset of the population used to represent the whole.

Front

How do you find the mode of a data set?

Back

The mode is the number that appears most frequently in a data set.

Front

What is a frequency distribution?

Back

A frequency distribution is a summary of how often each value occurs in a data set.