When should a bar graph be used? a. when there is no independent variable. b. when the independent variable is continuous and does not show a relationship to the dependent variable. c. when the independent variable is continuous and shows a causal link to the dependent variable. d. when the independent variable is composed of categories and does not show a relationship.
12. The independent variable is usually after IF. e.g. "If I increase the temperature in my freezer (independent, I change it), then my ice cream will melt (dependent, I didn't make it happen directly).
13. I feel like that's answered above. :)
14. Unanswerable without more info.
15. (see above).
16. A control is something you leave alone, don't apply the independent variable to (likely there was a control in this experiment, but I have no way to be sure).
17. Data collection should take place during the experiment.
18. (see 15)
19. Background research lets us make educated hypotheses and develop procedures that won't injure us or damage our results.
20. If a hypothesis is rejected or disproven, a scientist develops another one.
21. Pumice floats on water, while obsidian sinks. So, obsidian, water, pumice.
Hope that helped!
D. Performing a fair test in which only the independent variable affects the dependent variable.
Validity is a measure of how correct the result of the experiment is. The validity of the experiment is based upon the correctness of the research topic, and correctness and implementation of the scientific procedures.
Performing a fair test that can be based upon use of the independent and dependent variables can yield results which will be valid and acceptable. The independent variable in an experiment is the variable which can be changed to know it's affect on the dependent variable. The dependent variable will help in determining the result of the experiment.
i do not know and i have a 100 in this class