New Zealand
Level 6 - NCEA Level 1

# Centre or Spread ?

## Interactive practice questions

The two dot plots below represent the scores of students from two classes in the most recent grade test.

a

Without performing any calculations, which class has the greater MAD?

Class A

A

Class B

B

Class A

A

Class B

B
b

If a student scored below their class average, in which class would they prefer to be?

Class A

A

Class B

B

Class A

A

Class B

B
Easy
Less than a minute
Sign up to try all questions

Consider the distribution of the data presented in this histogram.

Which of the following statements is true?

In an entrance exam, applicants completed two papers.

On average, students performed better in Paper $1$1, but their marks were less spread out from the mean in Paper $2$2. The MAD of Paper $2$2 could be:

Concerned that his heart rate was irregular, Derek’s doctor measured his heart rate (in beats per minute) $6$6 separate times in the space of an hour. They were:

$82,95,90,95,81,94$82,95,90,95,81,94

### Outcomes

#### S6-1

Plan and conduct investigations using the statistical enquiry cycle: A justifying the variables and measures used B managing sources of variation, including through the use of random sampling C identifying and communicating features in context (trends, relationships between variables, and differences within and between distributions), using multiple displays D making informal inferences about populations from sample data E justifying findings, using displays and measures.

#### 91035

Investigate a given multivariate data set using the statistical enquiry cycle