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Example : A weighing machine without any display was used by an averge of 320 persons a day with s.d. of 50 persons. When an

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Example : A weighing machine without any display was used by an averge of 320 persons a day with s.d. of 50 persons. When an attractive display was used on the machine, the average for 100 days increased by 15 persons. Can we say that the display did not help much? Use a level of sign. Of 0.05

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