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NZAMT NZQA NZ Grapher NZ Maths Census at School Study It

Asking A Statistical Question

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

2



Asking Statistical Questions

Identify TWO Variables

A PROBLEM: "I wonder if there is a relationship between variable 'A' and variable 'B' from the Census at School 2009 database"

The POPULATION must be included in the question

Class notes, Blank notes

Worksheet practicing writing statistical Questions

 

Given this data what research questions are possible?

Pam’s Pork Pies                          

Pie

Pie Weight
g

Pie Volume
mL

Pie Diameter
cm

A

377

157

5.1

B

392

165

5.3

C

338

134

4.8

D

333

132

5

E

418

172

5.9

F

402

167

5.3

G

319

118

5.2

H

324

128

4.9

What are the three research questions
possible?

 

 

 

 

 

“I wonder if there is a relationship between ……….…… and ……………… from the 2009 Census at school Database”

 

Defining the variables used:

Variables need to be specified, with units and causality considered.

Eg Student height is measured in…
Student arm span is measured in…

There is probably an 'association' between the student height and arm span.

In this case the variables are probably neither ‘explanatory’ nor 'dependant'

Sometimes one variable probably causes the other to change
Eg: Fat content (g) in take away food, and the energy content (calories)

 

 

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