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Nayland College - Mathematics

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NZAMT NZQA NZ Grapher NZ Maths Census at School Study It

3.9 Bivariate HOME | Achievement Objectives | Overview | Data sets & Variable Types | Introduction | Scatter plots | Excel | iNZight | Correlation Coefficient & Linear Model | The effect of Groups & Unusual Values | Predictions | Causality | Non-Linear Models | Discussion & Conclusion | Report Writing

Writing a Conclusion (Discussion)

12

Discussion

Investigating underlying groups (effect of groups)

Limitations due to the initial data set (and how the data was collected) or how you did your analysis

Unusual values. Identify & comment, More information is needed regarding an unusual value. Is it an error or different for a reason?
The presence or absence of an unusual value can significantly affect values of the correlation coefficient 'r' The correlation coefficient lacks resistance. (refer to outliers)

Other Models. Is the linear model appropriate? Other models better and suit the context better?

Any potential sources of bias, in the analysis or the original data?

Discuss any assumptions made during your investigation.

Relevance & usefulness
Who may find your investigation relevant & useful? For what possible purpose? Discuss in context. How widely the findings can be applied?

Conclusion: ARSE
Answer the Research Question
Research – Relate your findings to some research you have done
Summarise your findings
Evaluate the process

Discussion
Class notes, Class notes
Conclusion
Class notes, Class notes
Class site

plots residuals, regression lines etc http://stat-www.berkeley.edu

Class Exemplar:
Hawai'i Island Chain: Data csv, Information page |
Google Doc write up

Class Exemplar:
American New Cars 1993
Data csv, Information pdf |
Google Doc write up

Booklet pg14