In the article "Experimental Measurement of the Stopping Performance of a Tractor- Semitrailer from Multiple Speeds", NHTSA, DOT HS 811 48, June 2011, the following stopping distances (in feet) for a particular truck at 20mph were given: 32.1; 30.6; 31.4; 30.4; 31.0; 31.9 Do the sample data suggest the true mean stopping distance exceeds 30 feet? Conduct an appropriate hypothesis test on a=0.05.

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