Question

2. For the following testable hypotheses, identify the independent and dependent variable. Hypothesis: A person's resting heart rate will drop after cycling for 1 hour 3x per week for three months. INDEPENDENT VARIABLE DEPENDENT VARIABLE Hypothesis: In a patient with a bacterial blood infection, 50 mg of penicillin applied once in an IV drip will kill more bacteria than giving the patient 50 mg of penicillin in a single pill ingested orally. NDEPENDENT VARIABLE DEPENDENT VARIABLE Hypothesis: The frequency of heart attacks in men aged 50 60 years old is lower in men who take an aspirin a day compared to those who do not. INDEPENDENT VARIABLE DEPENDENT VARIABLE

Answer 1

INDEPENDENT variable = Change in Expt doesn't affect it and person doing Experiment chooses it. it's constant

and DEPENDENT variable is which is dependent on independent variable

Ans 1 : Here heart rate is dependent variable as it depends on cycling and cycling is independent variable

2 Ans: Here Bacteria is dependent variable as it's killing depends on Penicillin and penicillin is independent variable

3 Ans : Here Frequency of heart rate is dependent as it depends on aspirin ingestion and aspirin ingestion is independent variable