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Data Collection Accuracy

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Data Collection Accuracy

Read each question carefully. Give clear explanations where asked, and check that your answers are recorded consistently.

Collecting Data Carefully

1.Name three different ways a Year 8 class could gather information for a school investigation.

2.A class wants to find out which lunch option students prefer. Which method is most suitable?

Ask a range of students to complete a short survey
Measure the length of students’ lunchboxes
Watch students without asking what they prefer

3.A researcher needs the heights of students in a class. Which method is most likely to produce accurate measurements?

Ask each student to estimate their own height
Measure each student with the same suitable measuring equipment
Guess each height by comparing students

4.Identify four possible problems that could make collected data less accurate or less representative.

5.Explain how careful data collection helps people make trustworthy conclusions.

A Data Dictionary

A data dictionary explains what each variable means and how its values should be recorded.

Variable name

Description

Units or recording notes

First name

__________

Use first name only; do not record a surname

Travel mode

How the student usually travels to school

__________

Duration of the journey to school

Minutes, rounded to the nearest 5

6.Give one reason to write a data dictionary before gathering responses for a survey.

Checking Data and Acting Ethically

Kai — Teal

Nathan — Blu

Levi — Green

Manaia — 12

Harrison — Red

Zoe — Purpel

7.Write the three likely errors in the favourite-colour responses and give a reasonable correction for each.

8.A set of student heights in centimetres is 154, 161, 158, 42, 166, 160. Which value looks unusual, and how could you check whether it was recorded correctly?

9.State one ethical action to take when collecting information from other students.