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0 Polymer composite materials have gained popularity because they have high strength to weight ratios...

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0 Polymer composite materials have gained popularity because they have high strength to weight ratios and are relatively easy and inexpensive to manufacture However their nondegradable nature has prompted development of environmentally friendly composites using natural mate rials The article Properties of Waste Silk Short Fiber Cellulose Green Composite Films J of Composite Materials 2012 123 127 reported that for a sample of 10 specimens with 2 fiber content the sample mean tensile strength MPa was 51 3 and the sample standard deviation was 1 2 Suppose the true average strength for 0 fibers pure cellulose is known to be 48 MPa Does the data provide compelling evi dence for concluding that true average strength for the WSF cellulose composite exceeds this value

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