Question

Does caffeine increase anxiety levels? A researcher knows that on average, 18% of adults experience symptoms of anxiety. A study of 250 people was conducted where they were given a Starbucks triple shot beverage, and then took a test to determine if they were experiencing anxiety, which resulted in 52 people experiencing anxiety symptoms. Assume all CLT conditions are met.

Use 5% significance to test if caffeine increases anxiety levels. The hypotheses are given below. Clearly indicate in your work your test statistic, p-value, and conclusion.

H₀: p = 0.18
H₁: p > 0.18

Answer 1