Metric System:
- What is the best way to consistently obtain accurate measurements that are reproducible? Explain your answer and briefly describe in how you will limit your variables when performing the measurement:
- How many moles are in 10 grams of NaCl?
- How many moles of water are in 1 gram of water?
- How many moles of water are in ul of water?
Use the following observational example: “The effect of sleep deprivation on student exams score” to fill in 5 the steps for the scientific method below.
- Observation
Provide a possible question about sleep and test scores:
- Hypothesis
Make a prediction by suggesting an answer to the question above based on your observation. Make a hypothesis about sleep and test scores:
- Investigation
Design experiments to test the hypothesis. What can you do to answer the question you posed? Brief Experiment example:
- Analysis
Conduct the experiment and collect the data(result) from experiments and assess the results. What data do you expect to gather from your experiment?
- Conclusion
Formulate possible conclusions from your data, compare to the other studies. May revise hypothesis. Based on your sample data, what conclusion can you make?
Experiment:
“Is there a relationship between the arm span and the height of an individual?”
Here is the analysis: Sex=F, Arm length-24.1cm, Arm Span=61cm, Body height=171cm, Ratio: Arm length to Body height=0.141, Correlation: Arm Span to Body Height= 0.357cmm.
Fill in the 5 steps below as we examine the possible relationship of arm and body height.
- Observation
- Hypothesis
- Investigation
- Analysis
- Conclusion
A scientists wants to study the effects of pravastatin drug on cholesterol levels in rats. Her hypothesis is “In rat model, cholesterol level is inversely proportional to pravastatin level”.
Design an experiment to test this hypothesis.
Start by answering the following questions:
- What is the independent variable? What is the dependent variable?
- What does inversely proportional mean?
- What are the three confounding/control variables and how they should be controlled(held constant) in this experiment?
- What would be an appropriate control group for this experiment?
- What is the appropriate number of animals to study (the “n” of the study)?
- How many times will the “full” study be replicated?
- Now, in the space below, using the answers to the questions above, describe what you would do with the drug pravastatin and the rats to test the hypothesis that pravastatin inversely affects cholesterol levels (design an experiment that will generate data that will either support or contest this hypothesis).
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