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Trees and Data Exploration

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Trees and Data Exploration

Read each question carefully. Use the tree survey table where needed. Give clear answers and show your working for calculations.

Vocabulary

Match each term with the definition that best describes it.

Classify the information

For each situation, identify whether the information is primary or secondary data, and whether it is categorical or numerical data.

1.Mere counts 17 tōtara trees during a walk through a reserve. Classify the count by how it was collected and by its data type.

2.Hemi reads a council report stating that a reserve contains 240 native trees. Classify this information by how it was collected and by its data type.

3.A class asks people to name their favourite native tree. The answers include rimu, kauri and kōwhai. Classify the information by how it was collected and by its data type.

4.Give one example of numerical primary data that could be collected by observing trees in a local park.

Tree type

Number counted

Kōwhai

Rimu

Kauri

Pōhutukawa

Tōtara

5.Using the reserve survey table, which tree type had the greatest count?

Kōwhai
Rimu
Kauri
Pōhutukawa

6.Add all five counts in the reserve survey table. How many trees were counted altogether?

7.In the reserve survey, are the tree names categorical data or numerical data?

Categorical data
Numerical data

8.A regional report estimated that native forest covered 12.7 million hectares in 1850 and 5.9 million hectares in 2000. How many million hectares were lost over that period? Show your calculation.

9.You want to find out how many of your classmates have seen a native tree growing in the wild. Would a survey or secondary data be more useful? Explain why.

Extension

Plan a way to collect useful data about native trees.

10.Write a survey question about native trees that would produce numerical data. Then explain who you would ask or what you would observe, and how you would record the results.

11.A conservation group wants to identify native tree species that may be at risk in its region. Should it use primary data, secondary data, or both? Explain your choice and give one example of each type it could use.