A researcher claims that 10 of all safety helmets have manuf

A researcher claims that 10% of all safety helmets have manufacturing flaws. To test this claim (H0: p = 0.10), a random sample of helmets was selected and the sample proportion of helmets with flaws calculated. After further calculations, a 99% confidence interval on the true proportion of helmets that have flaws was found to be (0.12, 0.18) and a decision was made about the claim of the true proportion of helmets with flaws. Using the same level of significance, which of the following p-values would lead to the same conclusion (same conclusion as found using the confidence interval) about the claim H0: p = 0.10 A. 0.12 B. 0.025 C. 0.001 D. 0.05

Solution

C. 0.001