The article "Compatibility of Outer and Fusible Interlining Fabrics in Tailored Garments (Textile Res. J., 1997: 137-142) gave the following observations on bending rigidity smN ? md for medium-quality fabric specimens, from which the accompanying Minitab output was obtained:

Would you use a one-sample t confidence interval to estimate true average bending rigidity? Explain your reasoning.

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24.6 12.7 14.4 30.6 16.1 9.5 31.517.2 46.9 68.3 30.8 116.7 39.5 73.8 80.620.3 25.8 30.9 39.2 36.8 46.6 15.6 32.3 Normal Probability Plot 95 2.80 50- .20 05 01 001 20 70 120 bendrig Average: 37.4217 Std Dev: 25.8101 N of data: 23 W test for normality R: 0.9116 pvalue (approx):0.0100