Bias
is any systematic error that makes a particular experimental outcome more or less likely.
Do the results of an experiment have to match the hypothesis Why or why not?
A hypothesis provides an answer to the research question and must be testable. Scientists test a hypothesis by running experiments and making observations. Then they analyze the results, or data. … The
conclusion
is an explanation of whether or not the results supported the hypothesis.
What do you call the factors that affect the experiment?
A variable
is anything that can change or be changed. In other words, it is any factor that can be manipulated, controlled for, or measured in an experiment.
Why is it better to conduct an experiment more than once?
When we do experiments it’s a good idea to do multiple trials, that is, do
the same experiment lots of times
. When we do multiple trials of the same experiment, we can make sure that our results are consistent and not altered by random events.
What factor doesn’t change during an experiment?
Constant
– The factors that do not change during the experiment. Control – The control is the group that serves as a standard of comparison.
What are constant factors called?
The factors that can change value during an experiment or between experiments, such as water temperature, are called variables, while those that stay the same, such as
acceleration
due to gravity at a certain location, are called constants.
Is a factor that affects how an experiment works?
Independent variables
(IV): These are the factors or conditions that you manipulate in an experiment. Your hypothesis is that this variable causes a direct effect on the dependent variable.
What makes a reliable experiment?
Reliability.
When a scientist repeats an experiment with a different group of people or a different batch of the same chemicals and gets very similar results
then those results are said to be reliable. Reliability is measured by a percentage – if you get exactly the same results every time then they are 100% reliable.
Why do you repeat experiments 3 times?
Repeating an experiment more than once
helps determine if the data was a fluke
, or represents the normal case. It helps guard against jumping to conclusions without enough evidence.
What recommendations can you make to improve the results of your experiment?
You can increase the validity of an experiment by
controlling more variables
, improving measurement technique, increasing randomization to reduce sample bias, blinding the experiment, and adding control or placebo groups.
What are 2 things that must remain constant for this experiment?
There must be an independent variable, which changes throughout the course of an experiment; a dependent variable, which is observed and measured; and
a controlled variable
What are the 2 groups in a controlled experiment?
The group that receives the treatment in an experiment (here, the watered pot) is called the experimental group, while the group that does not receive the treatment (here, the dry pot) is called
the control group
. The control group provides a baseline that lets us see if the treatment has an effect.
Which variable is changed on purpose?
The part that is changed on purpose is called
the independent variable
.
What are two constants?
There are two main types of constants you may encounter in experiments:
true constants and control constants
.
What is used for comparison?
Adjectives and adverbs
can be used to make comparisons. The comparative form is used to compare two people, ideas, or things. The superlative form with the word “the” is used to compare three or more.
What are constants and controls?
A constant variable
does not change
. A control variable on the other hand changes, but is intentionally kept constant throughout the experiment so as to show the relationship between dependent and independent variables.
