An agricultural region predominantly grows one variety of wheat that has an average yield of 3.5 tons per hectare. A seed company has developed a new variety and claims that the average yield is higher than the commonly used variety. To test this assertion, nine experimental plots are planted with the new variety, and the following yields are obtained (in tons per hectare). 3.15,3.92,4.26,3.36,3.72,4.19,3.42,4.38,4.50. Assume a significance level of 5%.

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