INTRODUCTION
SCIENTIFIC INQUIRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Hypothesis
|
|
|
independent variable
|
|
|
Dependent variable
|
|
|
controlled experiment
|
Detailed explanation-1: -As long as the experiment is repeated a sufficient number of times, it does not matter how many variables are used. Yes, an experiment should test only one variable at a time. This ensures that the experimental outcome is clearly due to one identifiable factor.
Detailed explanation-2: -The independent variable is the one that is changed by the scientist. To insure a fair test, a good experiment has only ONE independent variable. As the scientist changes the independent variable, he or she records the data that they collect.
Detailed explanation-3: -In a “controlled experiment” only one variable is changed at a time. All other variables should be unchanged or “controlled”.
Detailed explanation-4: -A controlled experiment works with one variable at a time. If several variables were changed at the same time, the scientist would not know which variable was responsible for the observed results.
Detailed explanation-5: -A controlled experiment is an experiment in which only one variable is changed at a time. All other variables should be kept unchanged or controlled.