D.11 Answers: Describing variables
Answers to exercises in Sect. 11.5.
Answer to Exercise11.1:
Foliage biomass: quantitative continuous.
Tree diameter (in cm): quantitative continuous.
Age of the tree (in years): quantitative continuous.
Origin of the tree: Qualitative nominal.
Answer to Exercise 11.2:
1. Systolic blood pressure: quantitative continuous.
2. Program of enrolment: qualitative nominal.
3. Academic grade: qualitative ordinal.
4. Number of times people visited the doctor last year: quantitative discrete.
Answer to Exercise 11.3:
1. Age: qualitative ordinal.
2. Gender: qualitative nominal.
3. Location: qualitative nominal.
4. Social media use: qualitative ordinal.
5. BMI: quantitative continuous.
6. Total sitting time, in minutes per day: quantitative continuous.
Answer to Exercise 11.4:
Gender: Qualitative nominal.
Age: Quantitative continuous.
Height: Quantitative continuous.
Weight: Quantitative continuous.
GMFCS: Qualitative ordinal.
Answer to Exercise 11.5:
Fertilizer dose: Quantitative continuous.
Soil nitrogen: Quantitative continuous.
Fertilizer source: Qualitative nominal.
Answer to Exercise 11.6:
Response of kangaroos: Qualitative ordinal. (Or perhaps nominal?)
Height of drone: ‘Height’ is quantitative,
but with just four values used it would probably be treated as qualitative ordinal.
Mob sizes: Quantitative discrete.
Sex: Qualitative nominal.
Answer to Exercise 11.7:
Location is the only variable
(something observed from the individuals).
The number of people and the percentage of people who died at each location
is a summary of the data collected from the individuals.
‘Location’ is a nominal, qualitative variable, with seven levels.