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.