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Data Collection and Management

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Data Collection and Management

Answer each question. For multiple-choice questions, select the best answer; for Question 2, select all that apply.

Data Collection Basics

1.Why is random sampling useful when selecting people from a population?

It guarantees that the sample matches the population exactly.
It gives each member of the population a chance of selection, reducing selection bias.
It means no permission is needed to collect information.
It always produces the largest possible sample.

2.Which practices are important ethical considerations when collecting survey data? Select all that apply.

Ask participants for informed consent.
Protect identifying information from unauthorised access.
Explain how the information will be used.
Keep collecting responses after a participant asks to withdraw.

3.What does a data dictionary provide for a dataset?

A definition and details for each variable, including how values are recorded.
A copy of every participant's completed survey.
A prediction of the results before data is collected.
A list of websites used to store the data.

4.A kura has 144 Year 11 students and wants a random sample of 24 to estimate typical travel time to school. Describe a practical method for choosing the sample.

Data Cleaning and Management

5.A survey records daily study time in hours for a group of students: 1.5, 2, 3, 0.5, 4, 2.5, 18, 1, 3.5, 240, 2. Identify the suspicious value or values and explain why they should be checked before analysis.

6.Give two reasonable ways to handle missing values in a dataset, depending on the context.

7.Write a concise data-dictionary definition for each variable in a survey of secondary students: commute time to school (minutes), transport mode, and days absent this term.

Apply Your Data Skills

8.A student survey records test results as percentages: 54%, 67%, 81%, and 93%. Suggest a way to group the results into categories for a summary, and show how each of these four scores would be classified. State the category boundaries you choose.

9.Plan an investigation into whether Year 11 students who take part in organised sport have different attendance from those who do not. State a sampling approach, the variables to collect, and one ethical safeguard.