## Why can you only test one independent variable at a time?

Testing only one variable at a time lets you analyze the results of your experiment to see how much a single change affected the result. If you’re testing two variables at a time, you won’t be able to tell which variable was responsible for the result.

## How many independent variables should be tested at a time?

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

## Why is it important to have only one tested independent variable in an experiment?

why it is important, in an ideal experiment, to have only one independent variable ? to prove/disprove an issue with just the one independent variable. If you had several variables in the experiment, you would not know which variable really caused the end result.

## Which of the following best describes a dependent variable in an experiment?

The correct answer here is A. In a scientific experiment, the dependent variable is the variable that is being tested and then measured. The answer referenced in D, the variable that is manipulated, is referring to the independent variable.

## Which of the following best describes a response variable?

Which of the following best describes a response​ variable? The variable that might change in response to a change in the explanatory variable. A response variable is the variable you hope to predict or explain. The explanatory variable explains or predicts changes in the response variable.

## Which of the following best describes the relationship between the independent and dependent variables?

Answer: The correct answer is the dependent variable changes in response to changes in the independent variable. Dependent variable is defined as the variable which varies in accordance to the change in independent variable.

## What predictor variable means?

Predictor variables are variables that are being used to predict some other variable or outcome. Predictor variables are often confused with independent variables, which are manipulated by the researcher in an experiment.

## Which of the following is a confounding variable in the study?

A confounding variable would be any other influence that has an effect on weight gain. Amount of food consumption is a confounding variable, a placebo is a confounding variable, or weather could be a confounding variable. Each may change the effect of the experiment design.

## What best describes a confounding variable?

A confounding variable is closely related to both the independent and dependent variables in a study. An independent variable represents the supposed cause, while the dependent variable is the supposed effect. A confounding variable is a third variable that influences both the independent and dependent variables.

## How do you handle confounding variables?

There are various ways to modify a study design to actively exclude or control confounding variables (3) including Randomization, Restriction and Matching. In randomization the random assignment of study subjects to exposure categories to breaking any links between exposure and confounders.

## How do you remove a confounding variable?

Strategies to reduce confounding are:

1. randomization (aim is random distribution of confounders between study groups)
2. restriction (restrict entry to study of individuals with confounding factors – risks bias in itself)
3. matching (of individuals or groups, aim for equal distribution of confounders)