Essential biology 01 statistical analysis

Essential Biology Due Date:Student Name: Candidate Number: 002171-xxxBlog resource: http://tinyurl.com/25uz2zfCite all sources using the CSE method (or ISO 690 Numerical in Word). The first example has been done for you.Complete the self-assessment rubric before submitting to Moodle. Avoid printing this if possible. 1. Define the following terms: a. Mean: a measure of the central tendency of a set of data. (1) b. Variability c. Standard deviation 2. Errors bars show variability in data (either range of data or standard deviation) State which two pairs of groups below can we see an overlap in the standard deviation of the data. a. And b. Andc. In which group is the mean NOT likely tobe significantly different to the mean ofgroup 3?- Graph taken from http://www.csupomona.edu/~jcclark/classes/bio542l/essays/graphtypes.html Stephen Taylor Bandung International School http://sciencevideos.wordpress.com

Essential Biology Due Date:Student Name: Candidate Number: 002171-xxx3. On the axes below, plot the following three curves (all have a normal distribution): a. Has the highest mean and a high standard deviation. b. Has the lowest mean, but the highest frequency at that mean. c. Has a mean between (a) and (b) and has the smallest standard deviation.4. Complete the following paragraph: ± 1σ (standard deviation) from the mean represents ____ % of all the data points. In data with a high standard deviation, data are clustered closer to/ further from the mean. In data with a low standard deviation, data are clustered closer to/ further from the mean. Overlapping standard deviations suggest two datasets are/are not significantly different. ___ % of all data fall within 2 standard deviations of the mean. Stephen Taylor Bandung International School http://sciencevideos.wordpress.com

Essential Biology Due Date:Student Name: Candidate Number: 002171-xxx 6. Calculate the means and standard deviations of these two Group A Group B groups of data (to one decimal place) 24 24 25 29 Show your working here. 26 25 23 23 25 29 25 32 26 34 27 31 23 32 23 29MeanStdevP= 0.004 (T-Test)7. In a t-test comparing Group A and Group B, the P value was calculated as 0.004. What does this P value tell us about these two sets of data? Explain your answer.8. Why does the scientific community place so much importance on significance tests such as the t-test?SKILLS CHECK I can calculate mean and standard deviation using: a. A graphical display or scientific calculator b. Microsoft Excel 2007 Stephen Taylor Bandung International School http://sciencevideos.wordpress.com

Essential Biology Due Date:Student Name: Candidate Number: 002171-xxx9. Use the t-table shown to perform the t-tests withthese examples. Make sure you follow conventionsand write everything down correctly each time (as inpart b).a. Which confidence limit do we normally choose inBiology? Why?b. A student measures 15 snail shells on the northside of an island and 16 on the south.H0 =Confidence =DF =Critical value =t is calculated as 2.02.So we reject/accept Ho.Conclusion:c. A student measures the resting heart rates of 10swimmers and 12 non-swimmers.t is calculated as 3.65.So:Conclusion: Stephen Taylor Bandung International School http://sciencevideos.wordpress.com

Essential Biology Due Date:Student Name: Candidate Number: 002171-xxx10. A researcher is investigating the link between air pollution and egg size in chaffinches. She measuresthe diameters of eggs at 8 sites near a factory and 9 sites out of town. The mean egg diameter by thefactory was 5.6cm, whereas it was 7.4cm out of town.t is calculated as 2.08So:Conclusion:11. A doctor is testing the effectiveness of two kinds of antiseptics against bacterial cultures. He sets upsix samples with antibiotic A and six with antibiotic B and after 2 weeks counts the numbers ofbacteria present in each. Mean counts: A = 5.6x104cells; B = 5.7x104cells.t is calculated as 1.97So:Conclusion:12. A recent study looking into male fertility found that men who drank 3 cups of coffee a day showedsigns of more sperm tail damage (39.1% of sperm) than those who did not (32.8%). 22 men sampleddrank no coffee. 18 drank 3 or more cups a day.t is calculated as 3.35So:Conclusion:9. Look at the graph below: Stephen Taylor Bandung International School http://sciencevideos.wordpress.com

Essential Biology Due Date:Student Name: Candidate Number: 002171-xxx13. Identify the true statements, according to the graph:a. There is no correlation between number of cellphones and number of students with asthma.b. There is a positive correlation between number of cellphones and asthma cases.c. There is a negative correlation between number of cellphones and asthma casesd. Increased numbers of cellphones cause an increase in numbers of students with asthma.e. Increased numbers of asthmatic cause increased numbers of cellphones in a school.f. There is no evidence of causality in this graph.14. Suggest two comparisons in which a causal relationship is likely (e.g. temperature and rate of reaction). a. Stephen Taylor Bandung International School http://sciencevideos.wordpress.com

Essential Biology Due Date: Student Name: Candidate Number: 002171-xxx Works Cited 1. Taylor, Stephen. Statistical Analysis (presentation). Science Video Resources. [Online] August 2010. http://sciencevideos.wordpress.com/bis-ib-diploma-programme-biology/statistical-analysis/. 2. Allott, Andrew. IB Study Guide: Biology for the IB Diploma. s.l. : Oxford University Press, 2007. 978-0- 19-915143-1. Self Assessment: Essential Biology Assessment Criterion Complete (2) Partially complete (1) Self MrT File names sensible, work complete and well- Presentation & presented. Filed in order of topic, and easy to NA access. All command terms highlighted or Organisation underlined. Sources cited using the CSE (ISO 690 numerical) Academic NA method, with Works Cited section complete and Honesty correct. All answers for the following command terms Most answers for the following command terms Objective 1 correct: correct: understanding Define Draw Label List Measure State Most answers for the following command terms Objective 2 All answers for the following command terms correct: correct: understanding Annotate Apply Calculate Describe Distinguish Estimate Identify Outline Most answers for the following command terms All answers for the following command terms correct: Objective3 correct: understanding Analyse Comment Compare Construct Deduce Derive Design Determine Discuss Evaluate Explain Predict Show Solve Sketch Suggest Logic, notation, Answers are presented in a logical and concise manner. SI units used most times, with correct mathematical NA unit symbols and definitions of terms. All working mathematical working shown. Evidence is apparent of research and reading beyond the textbook and presentations to findFurther research NA correct answers to challenging questions. If any questions are unanswered, this criterion scores zero. Total (max 10): Stephen Taylor Bandung International School http://sciencevideos.wordpress.com

Essential biology 01 statistical analysis

by mcnewbold

Accessibility

Categories

Upload Details

Usage Rights

Statistics

Essential biology 01 statistical analysis Document Transcript