You’re a civil engineer testing the compressive strength of concrete to be used in bridge construction. You test 16 concrete specimens, the resulting in the following compressive strengths (in psi). DATA: 2223 2329 2269 2244 2258 2325 2204 2296 2316 2272 2302 2342 2307 2205 2208 2311 a. Is the mean compressive strength greater than 2200 psi? Use the critical value approach and the appropriate table with 95% confidence. b. Is the mean compressive strength greater than 2200 psi? Use the p-value approach and Excel with 95% confidence. c. Is the standard deviation of compressive strength less than 50 psi? Use the critical value approach with 95% confidence.
Problem 5
You’re a civil engineer testing the compressive strength of concrete to be used in bridge
construction. You test 16 concrete specimens, the resulting in the following compressive
strengths (in psi).
DATA:
2223 2329 2269 2244 2258 2325 2204 2296
2316 2272 2302 2342 2307 2205 2208 2311
a. Is the
and the appropriate table with 95% confidence.
b. Is the mean compressive strength greater than 2200 psi? Use the p-value approach and
Excel with 95% confidence.
c. Is the standard deviation of compressive strength less than 50 psi? Use the critical value
approach with 95% confidence.
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