Ex01_S11-Analysis-1 - Group Members: Maria Bosquez, Valerie...

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Group Members: Maria Bosquez, Valerie Lopez, Natalie Myers, Lexi Ornell Exercise 1 Date: 1/20/11 LI Christina Hazard Unique 48835 Day: Thursday Room: PAI 1.18 Lab Start Time 9:00 AM BIO206L Spring 2011 Q.# 1-10 2 point each Total 10 points Exercise 1 Analysis To be completed as a group and turned in at the beginning of your next laboratory period. Include your “Data & Results”, sketches, acquired digital images, etc. as directed by your laboratory instructor. Show your work for all calculations and/or print your MS Excel data sheets. Be sure to include proper units where necessary. Adhere to University’s Honor Code and course policies. Balance between brevity and completeness. (1) Which device used in Section 1.3 seems to be the most accurate for measuring a 60-mL volume? State some reasons why this device might be more accurate compared to the others. The graduated cylinder had the most accurate measurement for the 60mL volume, because it had the lowest percent error. This was most likely due to the more precise measurement markings, and that it actually had a mark for 60 mL unlike the Erlenmeyer flask, for which we had to guess where 60 mL would be. Why can’t one determine which device seems to be the most precise based on the data collected in Section 1.3? What would one need to do to determine this? State the calculation one could use and rationale to decide? One can’t determine which device seems to be the most precise based only on the data collected in Section 1.3 because of personal error of each lab participant. For example, one person may be more accurate when using larger measuring tools than smaller, and vice versa. As previously stated, you can use the calculation of percent error as well as the rationale of individual errors when taking into account the precision of each tool. (2) Determine each of the three statistics (mean, standard deviation, and PEM) for the 9- mL volumes of water delivered with the 10-mL graduated cylinder (Section 1.4) and the 10-mL graduated pipet (Section 1.5). (a.) compare each of these three statistics obtained using your group data set with that obtained using the entire class data set . Discuss explicitly any differences between the two data sets and what might account for such differences by answering the following: Which data (group or class) has a mean closer to the target value? Our group’s data has a mean closer to the target value than the class mean. This may be attributed to the inaccuracies of other groups in the class, which would pull the class mean away from the target value. Which statistic indicates accuracy? Percent error indicates accuracy, because it tells us how far the experimental results are from the accepted value. Is the group data or the class data more accurate and why might this be so?
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This note was uploaded on 04/04/2012 for the course ECO 304K taught by Professor Hickenbottom during the Spring '10 term at University of Texas at Austin.

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Ex01_S11-Analysis-1 - Group Members: Maria Bosquez, Valerie...

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