Understanding Stem-and-Leaf Plots and Measures of Central Tendency

What is the primary purpose of a stem-and-leaf plot?

• To display data in vertical columns

• To organize data based on place value

• To calculate the average of data

• To compare two different data sets

In the context of the video, what does the 'stem' represent in a stem-and-leaf plot?

• The last digit of each data point

• The middle digit of each data point

• The total sum of all data points

• The first digits of each data point

How are two different data sets compared in a stem-and-leaf plot?

• By placing the stem in the middle and leaves on either side

• By using separate plots for each data set

• By using different colors for each data set

• By calculating the mean of each data set

What is the mean number of calories in drinks at the start of the school year?

• 136

• 137.9

• 111

• 154.7

Which value is the mode for the data set from the start of the school year?

• 137.9

• 111

• 154.7

• 136

What is the median of the October data set?

• 136

• 137.5

• 111

• 154.7

How does the outlier in October affect the mean?

• It makes the mean equal to the median

• It raises the mean

• It lowers the mean

• It has no effect on the mean

Which measure of central tendency is least affected by outliers?

• Mode

• Median

• Mean

• Range

Why is the median a better measure than the mean for the October data set?

• Because it is always higher than the mean

• Because it is easier to calculate

• Because it is not affected by outliers

• Because it represents the most frequent value

What measure should Max use to find out how many calories most students are drinking?

• Mean

• Range

• Mode

• Median