Question

Decreasing Experimental Error
Which procedures were followed in this lab to decrease experimental error? Choose three correct answers.
Responses

changing the volume of solution during each step
changing the volume of solution during each step

using three different temperatures instead of only two
using three different temperatures instead of only two

repeating the experiment three times for each temperature
repeating the experiment three times for each temperature

using different types of antacids with different chemical formulas
using different types of antacids with different chemical formulas

using three different surface areas instead of only two
using three different surface areas instead of only two

Answer 1

Correct responses:
- using three different temperatures instead of only two
- repeating the experiment three times for each temperature
- using three different surface areas instead of only two

Reason: increasing the number of tested conditions and repeating trials increases sample size and data points, which reduces random error and improves the reliability and precision of the results. Changing solution volumes or using different antacid formulas would introduce extra uncontrolled variation and increase error.