Answer: 3) Confounding variable
Explanation:Confounding variable is the variable that indicates about the external influential factors that produces the manipulated consequences of independent and dependent variable.This variable can lead to producing useless outcomes in an experiment.
According to the question, the changes occurring in interest of student in algebra can be due to the outside factors which are not generating the actual results and thus, experiment is getting ruined.
Other options are incorrect because application variable remain same for the experiment,system variable are the variables of certain system and reliability variables describe about the variable on which dependent or stable.Thus, the correct option is option(3)
I would say planning. the more time you had to plan the greater chance your travel will be successful
The correct option is C.
Evidence based tools refers to those tools which have been used by other researchers and which have been declared valid and feasible for research use and real time use.
When you want to use an evidence based tool, you have to ensure that the tool has been used in a situation that is similar to your own, this is necessary in order to obtain valid and accurate result.
