Vocab
What is the center in terms of looking at data?
The center is the middle of a data set. You can estimate it by looking at where most data values fall
What always goes on the y-axis of a histogram?
In the following data set, what is the frequency of the number 7?
6, 16, 1, 7, 8, 87, 9, 1, 7, 56, 7
3
The spread refers to how spread out the data values are.
What does a gap between numbers on the x-axis represent in a histogram? Give an example.
It means there are no data values in the data set for that range of numbers. Ex: With measuring worms yesterday, there were no worms between 80 and 90 millimeters.
Lucy played 10 basketball games. She recorded the number of points she scored and made a dot plot. Lucy said the she scored between 8 and 14 points in most of the 10 games, but one game was exceptional. During that game she scored more than double her typical score of 9 points. Use a number line to make a dot plot that fits this description.
(example on paper on purple file cabinet titled "Lucy's Dot Plot")
What is distribution when talking about data?
Distribution tells you many of each value or each category there are in the data set
When is using a histogram more useful than a dot plot?
Answers vary
-When the numbers are big (like 15 million)
-When there are 10+ data values within each category
-When the scale is big (ex: 5 million to 40 million rather than 1-7)
Turn to p. 43 in your workbooks and look at #2's dot plots. List the countries in order of typical travel times.
US, Canada, New Zealand, Australia, South Africa
What is a dot plot? Draw an example on a whiteboard.
A dot plot is a way to represent the distribution of a data set.
False-- 0-20 mm means 0-19.99. 20 would be the lowest data value in the next column.
Using the dot plots on p. 43 of your workbooks, list the countries in order of variability of travel times
US, New Zealand, Australia, Canada, South Africa
What is a histogram?
A histogram is a way to represent a data set by grouping data into bins/columns and showing how many data values are in each bin/column using frequency