Take this Quiz: A-Level Maths: Sampling and Data | Zestly

Question 1

A researcher wants to survey 50 students from a school of 1000, divided into Year 12 (400 students) and Year 13 (600 students). If they use stratified sampling, how many students should be selected from Year 12?

Accepted Answer

20

Question 2

Which of the following are valid limitations of using quota sampling in a large-scale study?

Accepted Answer

It is non-random and prone to researcher bias.

Question 3

In a histogram, the frequency density of a class interval is defined as:

Accepted Answer

Frequency / Class Width

Question 4

Which of the following statements regarding the standard deviation are true?

Answer

It is sensitive to extreme values (outliers).

Answer

It measures the spread of data around the mean.

Answer

It is always equal to the variance.

Answer

It can take negative values.

Question 5

In the context of linear regression, what is the primary risk of extrapolation?

Answer

It assumes the data is perfectly normally distributed.

Answer

It assumes the relationship between variables continues outside the observed range.

Answer

It requires the independent variable to be categorical.

Answer

It ignores the presence of outliers in the dataset.