3.1 ONE AND TWO VARIABLE DATA

Create a question that can be answered using the graph below.

Create a question that can be answered using the scatter plot below.

Create a question that can be answered using the table below.

Which graph/table showed two-variable data?

DEFINITIONS Variable – an attribute that can be measured One-variable data sets – give measures of one attribute for each person/thing *examples of situations where you see one-variable data – tally charts, frequency tables, bar graphs, Histograms, Pictographs, Circle Charts

DEFINITIONS Two-variable data sets – give measures of two attributes for each item in a sample. *Examples of situations where two-variable data sets are seen are ordered pairs, scatter plots, two-column tables of values

Identifying situations involving one-variable and two-variable data State whether each situation involves one-variable or two-variable data. Justify your answers. Jesse measures the amount of precipitation each month in Kitchener. Solution: you can use mean, median and mode to analyse the data so it is a one-variable situation (also, there is only one attribute being measured for each month)

One or two-variable data 2) The study involves statistics about the poverty level in a community and the level of education. Solution: The study involves two pieces of data for each person/family so it is a two-variable situation (finding relationships between the variables)

The following survey was completed in Dylan’s class: a) What type of graph would be best to show how many hours the students worked during the week? Justify your answer.

Decide which type of graph: b) What type of graph would be best to show the relationship between the number of hours a student spends at work during the week and weekend. Justify your answer.

PRACTICE P.133 #1a, 2, 3, 5, 8