Can anyone help me break this down? I am confused on every aspect. State the null hypothesis for: a. An experiment testing whether echinacea decreases the length of colds. b. A correlational study on the relationship between brain size and intelligence. c. An investigation of whether a self-proclaimed psychic can predict the outcome of a coin flip. d. A study comparing a drug with a placebo on the amount of pain relief. (A one- tailed test was used.) Reply to Thread