Which of the following statement(s) best defines an experimental investigation?A type of investigation performed by observing something in its natural environment.A type of investigation performed by observing something in its natural environment and comparing two or more things.A type of investigation where two or more things are being studied and described.A type of investigation that is conducted under controlled conditions in which a variable is identified.Preview

By definition, a valid investigation is one that:aims to answer a scientific questionhas a testable hypothesishas an independent variable and a dependent variabletests its intended hypothesis

What is the major difference between an experiment and an observational study?*1 pointA treatment is imposed in an experiment.Observational studies can use only one population.There two control groups instead of one in an experiment.An observational study can establish ca.use-and-effect relationshipsNONE OF THESE

There are three basic types of scientific investigations. A scientist may choose to perform a investigation to identify patterns in nature by comparing two or more items or groups. This type of investigation is limited, however, because it is unable to identify direct relationships between groups. Also, too many uncontrolled variables outside the experiment may affect results.A scientist may choose to perform a investigation because they can make detailed records of animals or species without interfering with the environment. Although it may be limited by and results cannot be repeated or verified.Lastly, an experimental investigation can show a relationship between two variables. The test can be repeated and replicated, as well as products tested before human purchase or use. The limits include human error and not being able to answer the 'why' the results are happening the way they are. Another limitation is that some variables controlled or tested in this setting.descriptivebenefitare sometimescomparativevalidresearcher biascannot bereplication

Which of the following best describes science?A.The use of observations and experiments to answer questions about the natural worldB.The study of the natural world in order to formulate answers to untestable questionsC.The use of experiments and investigations to form opinionsD.The study of the universe to answer philosophical questions

What is a natural experiment?Multiple choice question.Study of processes that do not involve humansStudy of an event that has already occurredStudy of an event that occurs outside