(Solution) - An article in the Journal of Composite Materials December 1989 -(2025 Original AI-Free Solution)

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An article in the Journal of Composite Materials (December 1989, Vol 23, p. 1200) describes the effect of delamination on the natural frequency of beams made from composite laminates. Five such delaminated beams were subjected to loads, and the resulting frequencies were as follows (in hertz): 230.66, 233.05, 232.58, 229.48, 232.58 Find a 90% two-sided confidence interval on mean natural frequency. Is there evidence to support the assumption of normality in the population?