Posts Tagged ‘variables’

Measurement test review

Wednesday, September 1st, 2010

pencil and ruler by mdxdt on flickr

Here are some useful links to help you with your revision.

For practice with scientific notation try this one or this one.

For reviewing significant figures try these sites: one, two, three, four.

For practice with converting units, look here.

For help with identifying the correct independent, dependent and control variables, try this.  And if you are a Spongebob fan, try this, or a Simpsons fan, try here.

Murphy’s Law toast drop

Tuesday, August 17th, 2010

bread toasts by FrancoisRoche on flickr

Click here for the information on this lab.

If you are confused about variables, this song might help.  Sing it loud, sing it proud!

Checklist for heart rate lab

Thursday, September 10th, 2009

Use this checklist, thanks to Mr. Hobbins, to help you with your heart rate lab.

Listed below are some of the finer points that are often the difference between a ‘c’ and a ’p’ grade in an aspect. You should be able to answer ‘yes’ to each of the questions.

Planning A Is your research question sufficiently focused?

Have you made a quantitative prediction in your hypothesis?

Have you fully explained your hypothesis?

Are your variables clearly shown i.e. not just one word?

Planning B

Have you included the volumes and concentrations of solutions used, sizes of glassware etc?

Are all of your controlled variables covered?

Do you plan to do enough runs?

Have you included a clearly labeled diagram?

Data Collection Is raw data neatly presented in a table?

Does the table have an uncertainty and unit value in the header row?

Have you made qualitative observations too e.g colour changes?

Are your significant figures/decimal places consistent?

Data Processing and Presentation If you have plotted a graph, have you labeled axes and drawn a line of best fit to extract more information?

Have you processed the uncertainty due to the equipment and shown this in your final answer (HL)?

Have you commented on the uncertainties of the equipment and how significant they might be in affecting the reliability of your result (SL)?

Conclusion and Evaluation Have you compared the result with literature data?

Does the percentage uncertainty cover your percentage error (HL)?

Have you identified flaws in the technique and suggested ways to improve them (N.B. ‘I ran out of time’ is not suitable)?

General Is every detail of the write up your own work?

Have you written in the passive voice?

Have you referenced any sources?

DP Biology Lab Report Format

Please follow this format for each practical investigation – it will help us see that you have covered all of the aspects that are needed to be marked ‘Complete’.

1. Research question or aim:  Clear and to the point. State the dependent and independent variables and species name [e.g. Apis mellifera] in the research question

2. Hypothesis: Predictions with reasons based on scientific theory or published data. What do you think is going to happen with reasons based on scientific theory or published data. This is then stated as a prediction as what you think will happen in your experiment. IF (independent variable) THEN (dependent variable) BECAUSE..”

3. Variables: Independent, Dependent, Controlled (a list here is enough).

4. List apparatus and materials (with amounts/sizes/quantities).

5. Method to control variables: Keep at least 3 factors constant to reduce experimental error.  Give a reason for each one.

6. Method for collection of raw data: What are you changing? How? What are you measuring? How? What units? How many data points will you produce? State them clearly. What will you do with the data collected?

7. Large, clear diagram or photo of set-up, clearly labeled.

8. Collect and record raw data, giving units and uncertainties.  e.g. using a mm ruler, error is +/- 1mm

9. Present the raw data in a large, clear, self-designed table. Give an informative title.  i.e. – ‘table of results’ is not descriptive enough.

10. Process raw data: Choose an appropriate graph/ chart/ statistical test.  Perform it correctly, giving a worked example for all calculations used.

11. Present processed data: Make table or graph large, clear and well labeled.  Include units and an informative title.

12. Draw conclusions: What do your results tell you?  What does this mean? Explain using scientific theory.  Does it agree with your hypothesis?  Compare collected data with published (literature) data if possible. Reference it appropriately.

13. Evaluate procedures and results: Identify (min 3) weaknesses, limitations and errors in the results and the method.

14. Improve the investigation: Suggest realistic methods to improve on each of the weaknesses mentioned above.

15. References.

Assessment coming up!

Thursday, August 20th, 2009

During the first week of SEPTEMBER you can expect to be given an assessment on what we have covered so far in G9 Integrated Science.  That means all the stuff on variables, units, significant figures, errors, science apparatus.  We’ll talk more in class about this but here is a link to some powerpoints you might find useful.   Click through the first few introductory slides to get to the good stuff 🙂

Variables     Measurement      Errors – click on “How science works – Errors”

Murphy’s Law toast drop

Monday, August 17th, 2009
bread toasts by FrancoisRoche on flickr

bread toasts by FrancoisRoche on flickr

Here is the lab sheet for the Murphy’s law toast drop.  Murphy’s Law G9 lab  Print a copy for yourselves if you would like to have a paper version. 

Don’t panic – there will be lots of help with the data collection and analysis part.  Don’t forget to bring in any “extra” spreads that you plan to test.  This should be fun!

Variables song

Monday, August 17th, 2009

pencil and ruler by mdxdt on flickrConfused about variables?  Dependent, independent, control, continuous… all covered in this song.  Make sure you sing out loud, not in your head!