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 Australian CensusAtSchool

CaSQ 17A - Scatter plots. Year level vs. Concentration Time

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 How to: Get a Random Sample from CensusAtSchool Go to the CensusAtSchool Random Sampler to download a sample. Reference year: (select year) Sample size: At least 30 students Select questions: Year level, Concentration Game Location: Select Location Year level: All To project privacy there is a rule built into the sampler that the requested sample size cannot exceed 10% of the respondents for the parameters entered.

This task is designed to be completed by hand drawing a scatterplot. It can also be completed using Excel or CAS calculator.

1. Using your CensusAtSchool random sample, enter both sets of thirty numbers as:

• a table in your workbook, or
• two columns in Excel, or
• two separate lists in your CAS calculator.

2. Create a scatter plot with your data.
• Think about which set of data is the independent and dependent variable,
• Plan your axes to include the highest and lowest values in the data and
• Include a title that includes the variable names.

3. Look at your graph. Can you see any trend or pattern to the data? Complete this sentence:

As school year level __________________, concentration time __________________.

Extension:

4. On your scatterplot draw a line of best fit by eye. Remember to consider the slope and the position of this line.

5. Use the line to complete the following sentence: Each time the school year level increases by 1 year, concentration time___________________ by _______ seconds.

6. Explain what this means in a sentence using your own words