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.
Task:
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
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