RESEARCH METHODOLOGY

INTRODUCTION

SCIENTIFIC INQUIRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In a controlled experiment, how many independent variables can be worked with at a time?
A
one
B
none
C
two or more
D
how ever many makes sense.
Explanation: 

Detailed explanation-1: -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: -A controlled experiment is one in which everything is held constant except for one variable.

Detailed explanation-4: -To ensure the internal validity of an experiment, you should only change one independent variable at a time.

Detailed explanation-5: -There are often not more than one or two independent variables tested in an experiment, otherwise it is difficult to determine the influence of each upon the final results. There may be several dependent variables, because manipulating the independent variable can influence many different things.

There is 1 question to complete.