28 Chapter 2 Description of Samples and Populations Exercises 2.1.1-2.1.4 For ea

Question

28 Chapter 2 Description of Samples and Populations Exercises 2.1.1-2.1.4 For each of the following settings in Exercises 2.1.1-2.1.4, (i) identify the variable(s) in the study, (i) for each vari- able tell the type of variable (e.g, categorical and ordinal, discrete, cic.), (il) identify the observational unit (the thing sampled), and (iv) determine the sample size. A to them reco (a) A bic 0125 (a) A paleontologist measured the width (in mm) of the last upper molar in 36 specimens of the extinct mam- mal Acropithecus rigidus. (b) A phy each an eig (b) The birthweight, date of birth, and the mother's race were recorded for each of 65 babies (a) A c A physician measured the height and weight of each of 37 children. cloudy noon a (b) An end content (a) (b) During a blood drive, a blood bank offered to check the cholesterol of anyone who donated blood. 2.2 Frequency Distribution A first step toward understanding a set of data and describe the data in summary for ally complementary aspects of summary measures of center, and measures of dis center, and spread of the data. A frequency distribution is simplya occurrences, of each value in the data se tabular form or, more vividly, with a graph the categories that a categorical variable tak each category for the data in the sample. He butions for categorical data. Example 2.2.1 Color of Poinsettias Poinsettias can be red, pis hereditary mechanism controlling the color.

Explanation / Answer

Answer for 2.1.1(a)

A paleontologist measured the width (in mm) of the last upper molar in 36 specimens of the extinct mammals Acropithecus rigidus.

i) To identify the variable(s) in the study : Width (in mm) of the last upper molar.

ii) To identify the type of the variable(s) in the study : Continuous variable.

iii) To identify the observational unit (the thing sampled) : Specimens of the extinct mammals Acropithecus rigidus.

iv) To determine the sample size : 36 specimens.

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