Statistics Review

What are the four parts of a statistical investigation?

• Posing a question

  Asking the question

  Graphing the question

• Posing a question

  Collecting Data

  Analysing Data

  Interpreting Results

• Analysing the data

  Looking at the data

  Reading the data

• Collecting Data

  posing the question

  Answering the question

Primary Data is...

• Obtained directly (by you)

• Obtained indirectly (by another person or group)

Secondary Data is...

• Obtained directly (by you)

• Obtained indirectly (by another person or group)

Categorical Data is...

• Grouped and written in words

• Ordered and written in number form

Numerical Data is...

• Grouped and written in words

• Ordered and written in number form

Population is...

• A census - collecting data from an entire population

• Collecting data from a small portion of the population

Sample is...

• A census - collecting data from an entire population

• Collecting data from a small portion of the population

We want to know what the most popular sports brand in school is. What is the population?

• Everybody in the school

• All grade 8 students

• The sports brands

• All the teachers in the school

Census or sample?
Robert wanted to know what 8E's favourite food was, so he asked everyone in 8E.

• Census

• Sample

Census or Sample?

Mr Brown wanted to know the most popular movie of the whole school, so he asked 20 random students in each year level.

• Census

• Sample