Question: 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

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 ip.

d. A study comparing a drug with a placebo on the amount of pain relief. (A one-tailed test was used.)

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