206L_analysis1 - 1. a) The graduated cylinder seems the...

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1. a) The graduated cylinder seems the most accurate. It is the closest to the target value and it has more markings than the other two instruments. b) One can’t determine the precision because there is only one measurement for each device. One would need to take at least three measurements with each device and calculate the standard deviation. The device with the lowest standard deviation would be the most precise because the data points are close together. 2. a) The group and class data have the same sample mean, so we can’t conclude which data is more accurate. The percent error of mean indicates accuracy. The standard deviation of the data indicates precision. The group data is more precise because each person measures out volume differently; therefore, there’s less variance when one person does all the measurements when compared to measurements taken by four or five different people. b) The graduated pipet is more accurate than the graduated cylinder because its percent error of mean is lower than the graduated cylinder. This is so because it’s easier with a graduated pipet to obtain the last few drops of solution by pumping them out. When using a graduated cylinder, it’s hard to obtain all of the solution do to adhesion of the solution to the inside of the graduated cylinder. The graduated cylinder is more precise because the standard deviation is lower than the graduated pipet. 3. a) Null hypothesis: sample mean of graduated cylinder = sample mean of graduated pipet b) group data: The water in the graduated cylinder had a mean of 8.52g with a standard deviation of +/- .02g. The water in the graduated pipet had a mean of 8.67g with a standard deviation of +/- .26g. The p-value calculated was .322. class data: The water in the graduated cylinder had a mean of
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This note was uploaded on 07/18/2011 for the course BIO 206L taught by Professor Unknown during the Summer '08 term at University of Texas at Austin.

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206L_analysis1 - 1. a) The graduated cylinder seems the...

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