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
Making a population inference - Conclusion
From the sample analysis we can make an inference about the population
Sample statistics may be of use: Mean Median, Mode, Minimum, Maximum
Making a conclusion based on the scatter plot and equation.
Answering our research question, with evidence. "I notice that..."
pg294 Ex18.02, pg370 Ex26.02
We use the sample statistics and graphs to make statements about the population.
We need to be aware that the sample will vary from the population
If the sample shows that there is a relationship between the two variables AND the sample size is reasonable (at least 30) then we can say there probably is a relationship in the population as well.
Remember the relationship can be…
To ensure that a sample represents a population we need a sample size of at least 30
Calculating ‘Sample Statistics’ may be useful as well.
Use Excel to calculate the mean, median, mode, maximum, and minimum for the data.
You will have to calculate the sample statistics for EACH of the variables.
=Average(click and drag over the data cells)
=Range(click and drag over the data cells)
Inter quartile Range
In your conclusion you MUST refer back to your research question