1213+Water+Drop+Experiments

The following data were collected by the seventh graders at the end of August, 2012.

The manipulated variable for each trial is shown in the first column of the table. Each number in the table represents the average size of a drop of water. (In one experiment, the type of liquid was varied.) For each condition, the 7th graders conducted three trials.

Table 1. The effect of pipette angle on the average size of a drop of water (measured in grams).
 * Angle of Pipette || Group 1 || Group 2 || Group 3 || Group 4 ||
 * 90 degrees (vertical) || 0.0363g || 0.02g || 0.04923g || 0.062g ||
 * 45 degrees || 0.04665g || 0.015g || 0.05415g || 0.0575g ||
 * 0 degrees (horizontal) || 0.04665g || 0.021g || 0.09183g || 0.0656g ||

Table 2. The effect of other variables on average drop size.
 * Person Making the drops || Drop Size (g) || Length of Dropper Barrel || Drop Size (g) || Type of Liquid || Drop Size (g) ||
 * 1 || 0.0223g || normal || 0.048g || water || 0.0385g ||
 * 2 || 0.036g || medium || 0.046g || glycerol || 0.0385g ||
 * 3 || 0.0336g || short || 0.038g || oil || 0.02316g ||

Homework from Friday, September 7...
Write four conclusions, one for each manipulated variable in the experiments. Here is the first conclusion, written as a rough draft. This conclusion is based on the angle of the pipette. When the angle of the pippette was changed, we noticed that Therefore, //Mr. Robinson concludes that the angle of the pipette does not have a large effect on the size of the drops//. The larger drops made by group three with the horizontal pipette are interesting and perhaps it's worth repeating the experiment a few times to be sure. However, most groups seemed to produce the same size of drop with each angle.
 * four different groups made four different sizes of drops. Some were small (0.02 g) and others were large (0.062 g).
 * the drops made by any group seem to be roughly the same size. For example, the drops made by group 4 were all roughly 0.6 g.
 * the only number that was larger was drop size for the drops made by group 3 holding the horizontal pipette.

Each conclusion should be one paragraph long. It must include your statement of the conclusion and reasons why you made the conclusion.