Data Collection and Management

Name:

Date:

📊 Part 1: Data Collection Basics

1. What is the main purpose of random sampling when collecting data?

To make data collection faster

To ensure every person in the population has an equal chance of being selected

To collect more data

To avoid using technology

2. Which of these are ethical considerations when collecting data? (Select all that apply)

Getting consent from participants

Keeping personal information private

Making sure data is accurate

Collecting as much data as possible

3. A data dictionary is:

A book about statistics

A document that explains what each variable in your dataset means

A list of all the data you collected

A way to store data safely

4. You want to find out the average height of Year 11 students at your school. There are 120 Year 11 students. Describe how you would use random sampling to select 30 students for your study.

🧹 Part 2: Data Cleaning and Management

5. Look at this sample data about student screen time (hours per day). Identify any obvious errors:

Data: 3, 5, 2, 25, 4, 6, 1, 8, 3, 150, 2, 7

Circle or highlight the errors: ________________________

Explain why these are errors: ________________________

6. What are two ways you could deal with missing data in your dataset?

7. Complete this data dictionary for a survey about NZ students' favourite sports:

Variable 1 - Age: _________________________________

Variable 2 - Gender: _________________________________

Variable 3 - Favourite Sport: _________________________________

Variable 4 - Hours per week playing sport: _________________________________

🎯 Part 3: Application Challenge

8. You have collected data about students' favourite subjects and their grades. The original data shows specific grades (like 85%, 92%, 78%). How could you recategorise this data to make it easier to analyse? Give an example.

9. Extension Challenge: Design a brief plan to investigate this question: "Do Year 11 students who play sport have better attendance at school?" Include: your sampling method, variables you would collect, and one ethical consideration.