Nayland College - Mathematics
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
Checking the data set and how to clean the data
Look for correct recording of data, consistent units, data errors, and zero entries
Any values that do not form a PAIR of variables are removed from the data set.
Is a strange data value an outlier or an incorrect value?
|Cleaning data Class notes, Blank notes|
“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”
We ‘clean’ the data by removing individual data values that are errors
Sometimes more data will be needed to get a sample set of 30 data values