Accuracy
refers to how closely the measured value of a quantity corresponds to its “true” value. Precision expresses the degree of reproducibility or agreement between repeated measurements. The more measurements you make and the better the precision, the smaller the error will be.
What is the result obtained from an experiment?
A scientific experiment has a beginning and an end. The results are
simply the end of the scientific experiment
: What you found in your study.
What is how well the results of an experiment agree with the accepted value?
Accuracy is the closeness of agreement between a measured value and a true or accepted value. Measurement error is the amount of inaccuracy.
Precision
is a measure of how well a result can be determined (without reference to a theoretical or true value).
What term describes the degree to which a group of measurements agree with each other?
The degree of exactness of a measurement is called
accuracy
. Other scientists must be able to recreate an experiment and obtain similar data.
What is used to compare our results of an experiment to?
A part of the experiment that is not being tested and is used for comparison of the experimental results.
A control group
should be used when conducting an experiment. This group receives the same attention as the test groups, however, it will not be influenced by the variable the other groups are testing.
How is accepted value determined?
Accepted value is sometimes called the “true” value or “theoretical” value, so you might see the formula written in slightly different ways:
PE = (|true value – experimental value| true value) x 100%
. PE = (|theoretical value – experimental value| theoretical value) x 100%.
When you explain something you your observations?
When you explain or interpret the things you observe. (Not a wild guess. It’s based on reasoning from what you already know.) Making a forecast of what will happen in the future based on past experience or evidence.
What is an experiment in statistics?
A statistical experiment is
a random or nondeterministic experiment
. Its features are that: each experiment is capable of being repeated indefinitely under essentially unchanged conditions.
What is the aim of given experiment?
An experiment usually tests a hypothesis, which is an expectation about how a particular process or phenomenon works. However, an experiment may also aim to answer a “
what-if” question
, without a specific expectation about what the experiment reveals, or to confirm prior results.
What do you call the expected result of experiment is called?
A result of an experiment is called
an outcome
. The sample space of an experiment is the set of all possible outcomes. Three ways to represent a sample space are: to list the possible outcomes, to create a tree diagram, or to create a Venn diagram.
Which of the following best describes precision?
Precision refers to
the closeness of two or more measurements to each other
. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise. Precision is independent of accuracy.
What is difference between accuracy and precision?
Accuracy is the
degree of closeness to true value
. Precision is the degree to which an instrument or process will repeat the same value. In other words, accuracy is the degree of veracity while precision is the degree of reproducibility.
Is it possible to have high accuracy and low precision?
Precision is a measure of reproducibility. If multiple trials produce the same result each time with minimal deviation, then the experiment
has high precision
. This is true even if the results are not true to the theoretical predictions; an experiment can have high precision with low accuracy.
What are the 7 scientific method steps?
- Ask a question.
- Perform research.
- Establish your hypothesis.
- Test your hypothesis by conducting an experiment.
- Make an observation.
- Analyze the results and draw a conclusion.
- Present the findings.
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 is a comparison in an experiment?
In an experiment testing the effects of a treatment, a comparison group refers
to a group of units (e.g., persons, classrooms) that receive either no TREATMENT or an alternative treatment
. The purpose of a comparison group is to serve as a source of COUNTERFACTUAL causal inference.
