wing compressive strengths (in psi). 3223 3329 3269 3244 3258 3325 3204 3296 3411 3316 3272 3302 3342 3307 3205 3208 3311 3291 a. Construct a 95% confidence interval for mean strength. b. Construct a 99% confidence interval for mean strength. c. Note what happens to the
4. You’re a civil engineer testing the compressive strength of concrete to be used in bridge
construction. You test 18 concrete specimens, the resulting in the following compressive
strengths (in psi).
3223 3329 3269 3244 3258 3325 3204 3296 3411
3316 3272 3302 3342 3307 3205 3208 3311 3291
a. Construct a 95% confidence interval for mean strength.
b. Construct a 99% confidence interval for mean strength.
c. Note what happens to the interval as confidence increases. Discuss.
Given that data
3223 3329 3269 3244 3258 3325 3204 3296 3411
3316 3272 3302 3342 3307 3205 3208 3311 3291
Sample size n =18
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