A fruit grower wishes to evaluate a new spray that is claimed to reduce the loss due to damage by insects. To this end, he performs an experiment with 27 trees in his orchard by treating 12 of those trees with the new spray and the other 15 trees with the standard spray. From the data of fruit yield (in pounds) of those trees, the following summary statistics were found.

Do these data substantiate the claim that a higher yield should result from the use of the new spray? State the assumptions you make and test at a = .05.

Transcribed Image Text:

Standard Spray 233 45 New Spray Mean yield 249 19 andard deviation