28. The variable that changes due to the manipulation of the independent variabl

Question

28. The variable that changes due to the manipulation of the independent variable is called the: (a) Explanatory variable (b) outcome variable (c) manipulated variable 29. A sample in which the respondents themselves decide whether to be included is called a: (a) Self-serving (b)voluntary response (c) selection (d)convenience 30. What is the level of measurement for academic letter grades such as A, B, C D, F or W? (a)ratio (b) ordinal (c) nominal (d) interval (e)categorical 31. Questions 31-33 pertain to the following study: Agricultural researchers are investigating whether a new form of pesticide will lead to lower levels of insect damage to crops than the traditional pesticide. What is the independent variable in this study? (a) Agricultural researchers (b) Type of pesticide used (c) Levels of insect damage to crops (d) Traditional pesticide (e) Amount of crop produced 32. What is the dependent variable in this study? (a) Agricultural researchers (b) Type of pesticide used (c) Levels of insect damage to crops (d) Traditional pesticide (e) Amount of crop produced 33. Would this be an observational study or an experimental study? (a) Observational (b) Experimental Questions 34 – 38 pertain to the following: Of the adult U.S. population, 36% has an allergy. A sample of 1200 randomly selected adults resulted in 33.2% reporting an allergy. 34. What is the population? (a) All adults in the U.S. suffering from allergies (b) All adults in the U.S (c) 1200 randomly selected adults (d) 36% of the adult population (e) All adults in the U.S. without allergies 35. What is the sample? (a) 1200 randomly selected adults with allergies (b) All adults in the U.S (c) 1200 randomly selected adults (d) 36% of the adult population (e) 33.2% reporting an allergy 36. What is the value of the statistic? (a) 1200 randomly selected adults (b) 36% (c) 33.2% (d) 36% of 1200 randomly selected adults (e) 33.2% of the adult population 37. What is the value of the parameter? (a) 33.2% (b) 36%

Explanation / Answer

(28) Output variable

(29) Voluntary response

(30) Ordinal

(31) Type of pesticide used

(32) Levels of insect damage to crops

(33) Experimental study

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