Research Methods Fundamentals
Getting your head around hypotheses is crucial for any psychology study. The null hypothesis predicts there'll be no difference or relationship between your variables, whilst the alternative hypothesis predicts there will be a difference. Think of it like betting - you're either saying "nothing will happen" or "something interesting will occur."
Variables are the building blocks of any experiment. The independent variable (IV) is what you change or manipulate, like giving one group caffeine and another group a placebo. The dependent variable (DV) is what you measure, such as reaction time. Watch out for extraneous variables - these sneaky factors could mess up your results if you don't control them properly.
When it comes to experimental design, you've got two main options. Repeated measures means the same participants do both conditions, which is great for controlling individual differences but can lead to order effects like practice or fatigue. Independent measures uses different participants for each condition, avoiding order effects but introducing the risk that your groups might be naturally different.
Top Tip: Always consider what could go wrong with your design - spotting potential problems early saves you from dodgy results later!