Nayland College

Nayland College - Mathematics

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NZAMT NZQA NZ Grapher NZ Maths Census at School Study It

Making A Plan

1.11 Bivariate Home | Assessment Criteria | Ask a Question | Make a Plan | Collecting Data | Cleaning Data | Making Scatterplots | Describing Scatterplots | Outliers | Line of Best Fit | Population Inference | Conclusion | Revision


Making a Plan

Identify VARIABLES: From the available data set what variables will be useful to establish a relationship (eg census at school)

Data types: Discrete and Continuous

Census At School: Groups available | Variables available | How to select and download a data set

Define a Problem, Decide on variables to be used, Downloading data sets,

Basic review on how to use Excel

Making a plan Class notes, Blank notes  


The two variables are graphed using a scatter plot.
Each point on the graph represents one data item.


The scatter plot is the basic tool
used to investigate relationships
between two quantitative variables.

Is there a relationship between the variables?

One variable dependant on the other (explanatory) variable?






                  Which way around should the variables go?


This topic will be completed using an EXCEL spreadsheet of provided data.

“I wonder if there is a relationship between the number of texts sent and time talking on a cell phone for students in year 11 at Nayland College”

What data would be useful to help answer this problem?

Is there a web site to find this data or do we collect our own?

Web sites: Census at School, or the Gamma maths data sets from

Collect your own? Design a suitable survey, with quantitative questions (NOT descriptive answers)
YES to: How many texts did you send in the last 7 days?
NO to: Do you use your cell phone: little, a bit, sometimes, often, lots,






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