PS-1.4; Design Of Scientific Investigations: Question Preview (ID: 1977)

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The main reason scientists design and conduct experiments is to
a) test hypotheses. b) keep their grant money. c) help mankind. d) support their conclusions.
A scientific investigation attempts to answer a question about
a) the relationship between 2 variables; if there is a predictable effect of one variable on another. b) good and bad. c) philosophical issues. d) how knowledge can best be used to serve the needs of mankind.
In order to write a hypothesis for an experiment, the investigator must first
a) identify the independent and dependent variables. b) decide what the outcome of the experiment will be. c) decide what materials he has to work with. d) choose an experimental procedure.
An experimenter should
a) conduct repeated trials of his experiment. b) run only a few trials of the experiment and stop when he gets the results he expected. c) run the least amount of trials of the experiment possible, to save money. d) run only one trial of the experiment.
Planning how to set up data tables and what kind of graph or analysis of data to do
a) should be done before beginning the experiment. b) can't be done until data is available. c) is done after all data has been gathered. d) is not a step in experimental design.
A control group
a) is used to see if the change in the DV is due to the IV or to some other factor. b) must always be used in a controlled experiment c) is the same thing as the controlled variables d) is treated differently from the experimental group, except the IV is still applied.
The conclusion statement of the experiment
a) should either be "the data support the hypothesis," or "the data do not support the hypothesis." b) does not need to be based on analysis of the data if the data do not agree with the hypothesis. c) doesn't always need to be logical; sometimes creative thinking is acceptable. d) does not need to refer to the data if the data don't agree with the experimenter's ideas.
Researching information related to the investigation
a) should always be done in the beginning stages of designing an experiment. b) should be done after data collection but before writing a conclusion. c) is not always a needed step in designing an experiment. d) tends to limit the researcher's creativity and is never a good idea.
Stating the purpose of a scientific investigation
a) should be done in the form of a testable question or problem statement. b) isn't a needed step in experimental design. c) should be saved for last, after you have done the experiment and know the results. d) is really a form of the experiment's conclusion.
The controlled variables in an experiment
a) are the variables that are held constant (are the same) during an experiment. b) include the IV and DV since the experimenter controls their values. c) don't have to be the same for every trial of the experiment. d) include the IV, but not the DV.
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