Question

In this lab you will test the research question "does physical stress cause a change in heart rate, pulse pressure, or blood pressure, as compared to a baseline, non stress condition in college students?"

a. What is the independent variable?

-activation of the hypothalamic-pituitary-adrenal (HPA) acis

-activation of the fight-or-flight response

-heart rate

-pulse pressure

-blood pressure

-stress condition

-time

-there is none

b. What is (are) the dependent variable(s)? Choose ANY that apply.

-activation of the hypothalamic-pituitary-adrenal (HPA) axis

-activation of the fight-or-flight response

-breathing rate

-heart rate

-pulse pressure

-blood pressure

-stress condition

-there is none

c. What is the comparater?

-baseline, non-stress condition

-college students

-IPHY 3435 students

-placebo condition

-stress condition

Answer 1

An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured in a scientific experiment.

Here researcher is trying to find out how physical stress cause change in heart rate, pulse pressure, or blood pressure.

Hence as per definition

a. Independent variable is stress condition

b. Dependent variables are heart rate, pulse pressure, blood pressure.

c. Further we compare it with baseline, non stress condition.

Hence comparater is baseline, non stress condition