Experiment 3: Pre Lab Questions 1. A student obtained the following densities fo

Question

Experiment 3: Pre Lab Questions 1. A student obtained the following densities for an experiment: 2.45 g/mL, 2.48 g/mL, 2.44 g/mL, and 2.30 g/mL. Is there a data outlier? Show your calculations. 2. A student intended to determine the density of distilled water using the method described in this experiment. What would the following procedural issues do to the calculated values? Thoroughly explain your answer. a. The meniscus was allowed to fall below the mark on the pipet before the water was b. c. d. transferred to the weighed beaker Some of the water was spilled from the beaker before it was weighed There was some air bubbles in water At the end of the delivery, the last drop of water was blown into the weighed beaker 31

Explanation / Answer

1. Arranging the points in ascending order: 2.30,2.44,2.45,2.48

Median = 2.44+2.45/2 = 2.445

Lower quartile = 2.44+2.30/2 = 2.37

Upper quartile = 2.45+2.48/2= 2.465

Interquartile range = 2.465-2.37= 0.095

Multiply by 1.5 : 0.095*1.5= 0.1425

Inner fences = 2.465+0.1425 = 2.6075 and 2.37-0.1425= 2.2275

As none of the values lies outside this range there are no outliers.

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