For each of the following settings in Exercises 2.1.1-2.1.4, (i) identify the variable(s) in the study, (ii) for each vari- able tell the type of variable (e.g., categorical and ordinal, discrete,...

answer 2.1.2 to 2.1.4

Extracted text: For each of the following settings in Exercises 2.1.1-2.1.4, (i) identify the variable(s) in the study, (ii) for each vari- able tell the type of variable (e.g., categorical and ordinal, discrete, etc.), (iii) identify the observational unit (the thing sampled), and (iv) determine the sample size. A total of 129 persons donated blood. For each of them, the blood type and cholesterol levels were recorded. 2.1.3 (a) A biologist measured the number of leaves on each of 25 plants. 2.1.1 (a) A paleontologist measured the width (in mm) of the last upper molar in 36 specimens of the extinct mam- mal Acropithecus rigidus. (b) The birthweight, date of birth, and the mother's race were recorded for each of 65 babies (b) A physician recorded the number of seizures that cach of 20 patients with severe epilepsy had during an eight-week period. 2.1.4 (a) A conservationist recorded the weather (clear, partly cloudy, cloudy, rainy) and number of cars parked at noon at a trailhead on each of 18 days. (b) An enologist measured the pH and residual sugar content (g/1) of seven barrels of wine. 2.1.2 (a) A physician measured the height and weight of each of 37 children. (b) During a blood drive, a blood bank offered to check the cholesterol of anyone who donated blood.