Question

according to the graph, the pansies in which treatment group grew about 0.2 cm between weeks 2 and 3? liquid

how much did the pansies receiving slow-release fertilizer grow from week 1 to 3?

about 0.9 cm
about 1.4 cm
about 2.1 cm

Explanation:

Identify the target group and weeks

We need to find the growth of pansies receiving Slow-Release fertilizer (green bars) from Week 1 to Week 3.

Read the height at Week 1

Using Scientific Measurement principles to read the bar graph:

• At Week 1, the green bar representing "Slow-Release" fertilizer is slightly below the \(3\text{ cm}\) line.
• It is approximately \(2.9\text{ cm}\).

Read the height at Week 3

• At Week 3, the green bar representing "Slow-Release" fertilizer is slightly above the \(5\text{ cm}\) line.
• It is approximately \(5.0\text{ cm}\) to \(5.1\text{ cm}\) (specifically, it aligns very closely with \(5.0\text{ cm}\)).

Calculate the growth

Subtract the Week 1 height from the Week 3 height:

$$ \text{Growth} = 5.0\text{ cm} - 2.9\text{ cm} = 2.1\text{ cm} $$

This matches the option "about 2.1 cm".

Answer:

• about 0.9 cm
• about 1.4 cm
• about 2.1 cm (Correct answer)