24. A company supplies plastic sheets for industrial use. A new type of plastic has been produced and the company would like to claim that the average stress resistance of this new product is at least 30.0, where stress resistance is measured in pounds per square inch (psi) necessary to crack the sheet. The following random sample was drawn off the production line. Based on this sample, would the claim clearly be unjustified?

Assume normality and use the 5 percent level of significance.

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30.1 32.7 22.5 27.5 27.7 29.8 28.9 31.4 31.2 24.3 26.4 22.8 29.1 33.4 32.5 21.7