3E WA2 Consolidation

A group of students wanted to conduct an investigation to find out the popularity of canteen stalls in CHR. They did so by manually counting the number of students who visited each of the stalls. They have decided to do so on one afternoon during their Geography lesson.

Which of the following strategy helps to improve RELIABILITY?

• Count by standing right in front of the canteen stalls

• Collecting data multiple days in a week.

• Appoint one designated counter per stall in the group to count to avoid double-counting

• Using a tally counter instead of manually counting

Gui Xin wants to interview CHR students about their happiness levels in school.

By increasing sample size of respondents to 30 and above (assuming population size is at 100), he can improve the validity of his results.

• True

• False

These are the scores of 10 students from a Geography class.

7, 15, 14, 14, 9, 13, 4, 8, 14, 13

What's the mode score?

'Median' refers to...

• Middle value for a set of data that has been arranged in ascending order

• Sum of all values in the data set divided by the number of values in the data set

• The most frequent value in the data set

Which of the following is not true about the convenience sampling method?

• It is easy and efficient.

• It involves randomly selecting samples from the population.

• It is biased and the sample may not be representative of the population.

• It is used when it is unnecessary or impractical to select a representative sample.

Which of the following explains why heated magma in the mantle rises to the surface, towards the lithosphere?

• It receives heat from the core.

• It expands and becomes denser.

• It contracts and becomes less dense

• It expands and becomes less dense.

Tectonic plates are dragged apart because of the rising magma that spreads beneath the more rigid lithosphere, exerting a force on the overlying plates.

• True

• False

Where does cooled magma (which becomes denser) sink towards?

The ____ (i.e., four-letter word)