One-Variable Statistics Grade 9

Front

What is the median in a data set?

Back

The median is the middle value when the data set is ordered from least to greatest. If there is an even number of observations, the median is the average of the two middle numbers.

Front

What is the mean of a data set?

Back

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

Front

What is standard deviation?

Back

Standard deviation is a measure of the amount of variation or dispersion in a set of values. A low standard deviation means that the values tend to be close to the mean, while a high standard deviation means that the values are spread out over a wider range.

Front

What does a box and whisker plot represent?

Back

A box and whisker plot visually displays the distribution of a data set, showing the median, quartiles, and potential outliers.

Front

What is the interquartile range (IQR)?

Back

The interquartile range (IQR) is the difference between the first quartile (Q1) and the third quartile (Q3) in a data set, representing the range of the middle 50% of the data.

Front

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

Back

To find the median of an odd set of numbers, order the numbers from least to greatest and select the middle number.

Front

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

Back

To find the median of an even set of numbers, order the numbers from least to greatest and calculate the average of the two middle numbers.

Front

What is a normal distribution?

Back

A normal distribution is a probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean.

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 in a normal distribution.

Front

What is the range of a data set?

Back

The range is the difference between the highest and lowest values in a data set.