Which hypothesis is testable using a scientific experiment?

A testable hypothesis is one that can be verified or falsified through experimentation and observation. For example, "Increasing the amount of sunlight a plant receives will increase its growth rate" is a testable hypothesis, as it can be examined by measuring plant growth under varying sunlight conditions. In contrast, hypotheses based on beliefs or unobservable phenomena, such as "ghosts exist," are not testable through scientific experiments.