Negative Controls
Interactive Video
•
Biology
•
12th Grade
•
Practice Problem
•
Hard
Jessica Davis
FREE Resource
5 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What was Dr. Johnson's initial hypothesis about caffeine?
Caffeine decreases blood pressure
Caffeine variability depends on the person
Caffeine increases blood pressure
Caffeine has no effect on blood pressure
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why was the initial experiment considered flawed?
Use of decaffeinated coffee
Incorrect blood pressure measurement
Lack of a control group
Too many participants
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What did the revised experiment include to improve the study?
All participants drank caffeinated coffee
Increased number of cups of coffee
Introduction of a decaffeinated coffee group
Only water was given to participants
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What additional control was introduced in the refined experiment?
No controls were used
Participants drank water
Participants were given tea
Participants drank energy drinks
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What was the final conclusion about the effect of caffeine on blood pressure?
Caffeine significantly increases blood pressure
Caffeine has no effect on blood pressure
Caffeine decreases blood pressure
Results were inconclusive
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