Statistics Review

Front

What is a statistical question?

Back

A statistical question is one that anticipates variability in the data and can be answered by collecting data that shows this variability.

Front

What is a non-statistical question?

Back

A non-statistical question is one that does not anticipate variability and typically has a single answer.

Front

What is the mean?

Back

The mean is the average of a set of numbers, calculated by adding all the numbers together and dividing by the count of numbers.

Front

How do you find the mean of a data set?

Back

Add all the values together and divide by the number of values.

Front

What is an outlier?

Back

An outlier is a value that is significantly higher or lower than the other values in a data set.

Front

How does an outlier affect the mean?

Back

An outlier can skew the mean, making it higher or lower than the central tendency of the rest of the data.

Front

What is the median?

Back

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

Front

How do you find the median of a data set?

Back

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

Front

What is the mode?

Back

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

Front

Can a data set have more than one mode?

Back

Yes, a data set can be bimodal (two modes) or multimodal (more than two modes) if multiple values appear with the same highest frequency.