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.
Practise Edexcel A Level Maths Hypothesis Testing with the Normal Distribution with exam-style questions for A Level Maths. 132 questions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
