A manufacturing process for high-precision optical lenses is designed to produce lenses with a mean thickness of 2.450 mm. The thickness of a lens is known to follow a normal distribution with a standard deviation of 0.012 mm. A quality inspector suspects that the process is malfunctioning and producing lenses that are on average too thin. A random sample of 16 lenses is taken, and the sum of their thicknesses is calculated as ∑x=39.088\sum x = 39.088∑x=39.088 mm.
Stating your hypotheses clearly, test at the 1% significance level whether or not the inspector's suspicion is supported.
209 exam-style questions on CCEA A Level Maths 4.6 Statistical hypothesis testing (A-level only), covering 4.6.1 Statistical hypothesis testing (A-level only), 4.6.2 Statistical hypothesis testing (A-level only), 4.6.3 Statistical hypothesis testing (A-level only), 4.6.4 Statistical hypothesis testing (A-level only), and 4.6.5 Statistical hypothesis testing (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.