Which statement is true about this argument? premises: if two angles form a linear pair, then they are supplementary. if two angles are supplementary, then the sum of their measures is 180°. conclusion: if two angles form a linear pair, then the sum of their measures is 180°. a) the argument is not valid because the premises are not true. b) the argument is not valid because the conclusion does not follow from the premises. c)the argument is valid by the law of syllogism. d)the argument is valid by the law of detachment.

Stu and ambrose are working together on a study of whether diet is related to students' mental health. first, they randomly select 10 students from the student center and 10 students from the office of counseling and psychological services. then, they ask students to rate their diet in terms of healthiness on a scale of 1-100 before completing a 20-item mental health survey. a) name one of the constructs being studied b) how was the construct you named above operationally defined in this experiment? e) was the variable you described above their independent variable, their dependent variable, or a controlled variable? d) what is a confounding variable? what is a potential confound in this study?