Refer to the Acoustical Science & Technology (Vol. 35, 2014) study of irrelevant speech effects, Exercise 7.14 (p. 323). Recall that subjects performed a memorization task under two conditions: (1) with irrelevant background speech and (2) in silence. The difference in the error rates for the two conditions-called the relative difference in error rate (RDER)-was computed for each subject. Descriptive statistics for the RDER values are reproduced in the following SAS printout. Conduct a test to determine if the average difference in error rates for all subjects who perform the memorization tasks exceeds 75 percent. Use α = .01 and interpret the results practically.

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Analysis Variable : RDER Std Dev Minimum Mean Maximum 71 78.1885070 63.2429128 -19.2710000 254.1090000