Irrelevant speech effects. Refer to the Acoustical Science

& Technology (Vol. 35, 2014) study of irrelevant speech effects, Exercise 7.14

(p. 351). 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 a = .01 and interpret the results practically.

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N The MEANS Procedure Analysis Variable: RDER Mean Std Dev Minimum Maximum 71 78.1885070 63.2429128 -19.2710000 254.1090000