This PowerPoint was designed to help my students with their mastery of the experimental design questions found in Objective 1: Nature of Science on the TAKS test in Texas. If your students are struggling with their understanding of experimental design, this lesson can help bring them some clarity. It helps students understand how to identify the independent and dependent variables, constants, hypothesis, control group and the conclusion. It also emphasizes that factors that can keep a hypothesis or conclusion from being valid (emotions, opinions, random sampling, and large sample size). Get the student note page for FREE! This is a great value.