17.| Space Shuttle: Epoxy Kevlar epoxy is a material used on the NASA tles. Strands of this epoxy were tested at the 90% breaking strength. The follow- ing data represent time to failure (in hours) for a random sample of 50 epoxy strands (Reference: R. E. Barlow, University of California, Berkeley). Let x be a random variable representing time to failure (in hours) at 90% breaking strength. Note: These data are also available for download at http://www.cengagebrain space shut- .com. 0.54 1.80 1.52 2.05 1.03 1.18 0.80 1.33 1.29 1.11 3.34 1.54 0.08 0.12 0.60 0.72 0.92 1.05 1.43 3.03 1.81 2.17 0.63 0.56 0.03 0.09 0.18 0.34 1.51 1.45 1.52 0.19 1.55 0.02 0.07 0.65 0.40 0.24 1.51 1.45 1.60 1.80 4.69 0.08 7.89 1.58 1.64 0.03 0.23 0.72 (a) Find the range. (b) Use a calculator to verify that Ex = 62.11 and Ex? (c) Use the results of part (b) to compute the sample mean, variance, and stand- = 164.23. ard deviation for the time to failure. (d) Interpretation Use the results of part (c) to compute the coefficient of varia- tion. What does this number say about time to failure? Why does a small CV indicate more consistent data, whereas a larger CV indicates less consistent data? Explain.

Q: -0.50 1.00 а) 0.60 -100 -0.50 b) 0.60 100 -1.00 -0.50 1.00 c) 0.60 -1.00 -0.50 1.00 d) 60 -1.00

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