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A researcher wants to test if a new caffeinated drink would significantly extend people’s circadian rhythm...

  1. A researcher wants to test if a new caffeinated drink would significantly extend people’s circadian rhythm (biological clock) beyond 24 hours. The researcher takes a sample of individuals (N = 30) and gives them the new caffeinated drink for daily consumption. The researcher then measures these participants’ circadian rhythm (M = 24.6 hours; s = 2.2).

(a) Calculate the 95% confidence interval for the sample.

(b) If you were to use the 95% CI to test the hypothesis “if the new caffeinated drink extends people’s circadian rhythm beyond 24 hours”, what would your conclusion be?

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