[Steps Shown] An article in the Journal of Composite Materials describes the effect of delamination on the natural frequency of beams made from composite laminates.
Question: An article in the Journal of Composite Materials 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 (hertz):
230.66, 233.05, 232.58, 229.48, 232.58
Check the assumption of normality in the population. Calculate a 90% confidence interval on the mean natural frequency.
Deliverable: Word Document 
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