A group of students investigated the effect of temperature on the rate of evaporation. They placed three glasses each containing 10 mL of water in different places. One glass was in the refrigerator at 40 degrees F, one glass was on the counter at room temperature at 72 degrees F and one glass was in a greenhouse at a temperature of 90 degrees F. After 12 hours, they looked at how much water was left in each glass What is missing from their method? method for data collection control dependent variable independent variable

## Step 1<br />The problem presents a scenario where a group of students are investigating the effect of temperature on the rate of evaporation. They have three glasses of water, each placed in a different temperature environment: a refrigerator at 40 degrees F, a counter at room temperature at 72 degrees F, and a greenhouse at 90 degrees F. After 12 hours, they measure the amount of water left in each glass.<br /><br />## Step 2<br />The students have identified the independent variable, which is the temperature at which the water is placed. This is the variable that they are changing in the experiment.<br /><br />## Step 3<br />The dependent variable is the amount of water left in each glass after 12 hours. This is the variable that the students are measuring changes in.<br /><br />## Step 4<br />The method for data collection is the process of measuring the amount of water left in each glass after 12 hours.<br /><br />## Step 5<br />However, the students have not mentioned a control group in their experiment. A control group is a standard for comparison in an experiment. It is a group where the independent variable is not applied, which allows the experimenters to compare the results of the experiment with the control group.<br /><br />## Step 6<br />In this experiment, the control group would be a glass of water kept at a constant, unchanging temperature, such as room temperature. This would allow the students to compare the rate of evaporation in the different temperature environments with the rate of evaporation in the control group.