A grain researcher is developing a new variety of wheat. They would like to know if the new strain has a higher yield than the current variety. The randomly select 20 individual acre plots on which to plant the wheat. The randomly assign the variety 11 plots and assign the current variety to 9 plots. The mean yield for the new variety is 53.9 bushels per acre with a standard deviation of 6.7 bushels. The mean yield for the current variety is t with a standard deviation bushels per acre a. Determine the value of the pooled standard deviation, around answer to two decimal places b. Determine the value of the test statistic t-(Round your answet to 2 decimal places)

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