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anthropo last won the day on November 20 2015

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    May 2016
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  1. I'm really struggling with data analysis questions in HL Biology at the moment. Does anyone have any tips on how to do them well? Thanks in advance
  2. I can't find any past LAQs that have come up with this command term so I'm pretty sure it should only come up for 8-mark SAQs. I can imagine it would be very difficult to write a 22-marker with 'explain' because it doesn't really lend itself to the discussion an LAQ needs
  3. Criterion A - Knowledge and Comprehension (9 marks) You will need to describe studies accurately and including details such as gender of participants and where the study was conducted.The studies have to be described accurately.Use the format Aims, Procedure, Findings, Conclusion to describe each study.Make sure the studies are relevant to the question and make sure they back up your point. Don't just describe and evaluate studies without linking them back to the question and your point.Criterion B - Critical Thinking (9 marks) Evaluate each of the studies considering some of these aspect:the gender of the participants - can this be generalized to the entire population?the culture it was conducted in - has the study taken an ethnocentric approach and only focused on one culture and therefore can't be generalized?the methodology of the investigation - for instance, if a study used the survey method, is this valid since the participants may not be truthful?when the study was conducted - are the results still valid today?ethical considerations - consider consent, right to withdraw, confidentiality, deception, etc. if the study did have ethical considerations, were these justified?experimenter biasare there alternative explanations for the findings of the study?do these findings compare with findings from other similar studies, particularly people who have also repeated this study?ecological validity - could the findings of this study be applied to a real-life setting?size of the sample size - link this to generalizabilityMake sure you don't just describe the findings, interpret them and link them back to the question.Criterion C - Organization (4 marks) Start each paragraph with a topic sentence that describes your point and links to the research that you will describe - don't go straight into describing a study.Use connectives such as 'however', 'conversely', 'similarly' to show development in your argument.Pay attention to the command term and make sure you follow it. For example, if the command term is 'evaluate', make sure you consider both strengths and weaknesses or if the command term is 'examine', you would talk about the underlying assumptions of each issue that you mention.Make sure each of your points are clear and backed up well with evidence. For each paragraph: (The examples are using the question:- "Discuss how biological and sociocultural factors influence one anxiety, affective or eating disorder") Topic Sentence - A sentence that sums up the point you are trying to make in the paragraph e.g. Major Depressive Disorder may be greatly influenced by stressful life events that the individual has experienced. Study - Describe a study that backs up your point you made clear in your topic sentence e.g. To demonstrate, Brown and Harris (1978) investigated the social origins of depression using a sample of 458 women of all ages, all of which were admitted to a hospital for psychiatric treatment of depression. They found that 82% had recently experienced a stressful life event, suggesting that this social factor plays a significant role in the etiology of depression. Evaluate the study - Consider all the factors I mentioned earlier e.g. A key bias in this study was that it was solely done on females, who have a statistically higher prevalence of depression that males and therefore the results may not be generalisable to all genders. While it suggests that the stressful life event does play a role, many people who do experience stressful life events do not get depression thus implying that it must be a combination of the event and some other factor, such as a biological predisposition. On the other hand, perhaps it is due to individual differences since some people may cope better with stress than others and therefore may have a lower likelihood of getting depression because of their personality type. Write a mini-conclusion for the paragraph - Sum up the main point you were trying to make and link it back to the question e.g. Stressful life events may influence depression by triggering any underlying, existing biological factors or may be one of the main causes for the onset of the illness. Hope this helps!
  4. A few people in my class did a replication of Loftus and Palmer and they used the Mann-Whitney U test rather than t-test since that fitted their type of data better, so it might be worth having a look into that
  5. The whole idea behind inferential statistics is to see whether you accept your experimental or null hypothesis. My teacher recommended that we work out our inferential statistics manually and put it in an appendix just so we understand all the steps involved. To explain it, you compare the lowest calculated value to the critical value, and if the calculated value is less than the critical value then the experimental hypothesis can be accepted. You can use this to form a conclusion for your investigation
  6. A few people in my class are doing data-based reports and you still have to formulate a research question and hypothesis. https://ibpublishing.ibo.org/server2/rest/app/tsm.xql?doc=d_4_biolo_tsm_1408_1_e∂=1&chapter=1 You can find a few samples in the link above to get an idea of the sort of structure you're aiming for, but make sure that you pay attention to the criteria of the IA since some parts of the criteria seem like they would be a little more difficult to get marks for on a data-based report compared to a hands-on experiment.
  7. The final deadline is the 15th January, but most people get theirs in well before that.
  8. No, it shouldn't. The theoretical yield is the maximum amount of product that can be formed if all of the reactant reacts whereas the experimental yield is how much actually reacts. The percentage yield would be calculated by: (experimental (actual) yield/theoretical yield) * 100
  9. That's a really unique idea and would definitely score you points for personal engagement. However, my concern is how would you gather quantitative data in order to do data processing? And how would you determine the 'quality'?
  10. Since there's excess oxygen, you know the iron disulfide is going to be the limiting reagent. The reacting coefficients tell you that 4 moles of iron disulfide form 2 moles of sulfur trioxide. mass/mr = moles 30.0g/(55.8+(32.1*2)) = 0.25 moles 0.25/2 = moles of SO3 = 0.125 moles moles * mr = mass 0.125 * (32.1+(16.0*3)) = 10g of SO3
  11. Here's how I would work it out: Use the formula to work out the amount of moles of both salicylic acid and acetic anhydride mass/Mr = moles moles C7H6O3 = 3.0/(12*7) + (6*1) + (3*16) = 0.022 moles moles C4H6O3 = 4.0/(12*4) + (6*1) + (3*16) = 0.039 moles The salicylic acid and acetic anhydride are reacting at a 1:1 ratio, which means you equal amounts of moles to form an equal amount of aspirin. Therefore, the salicylic acid is the limiting reagent so you will only be able to form 0.022 moles of aspirin. In grams this would be: Mr* moles = mass ((12*9) + (1*8) + (16*4)) * 0.022 = 3.96 g (When you do the calculations make sure you use the mass values in the data booklet which should be to two decimal places.)
  12. I'm currently in my second year of taking Spanish B on Pamoja since I wasn't able to take any of my school's language options. If you're really interested in the course and it's your only opportunity to take it then I would highly recommend it. It requires a lot more self-motivation than a typical course would as you're completely in charge of managing your time and completing the tasks but you definitely get as much support as you would in a traditional classroom. The teachers are great at giving detailed feedback and supporting you throughout the course. The only thing I really hate doing is group work, which is essential in Spanish B to do interactive orals, so I assume it would be less common in psychology. If you any specific questions about Pamoja, please do not hesitate to contact me!
  13. How essential is it that we have solid evidence for CAS (e.g. photos, signatures, etc.)? Or do we just have to write reflections and have them approved by our CAS coordinator?
  14. Honestly, most of biology HL is pure memorization. As long as you go through the textbook and make very detailed notes on each topic and do as many practice questions as possible. The syllabus is absolutely crucial and make sure you know it inside out. A 7 is totally in your reach.