Irrelevant speech effects. Refer to the analysis of irrelevant speech effects in Exercise 2.34

(p. 77). Recall that irrelevant speech effects refer to the degree to which the memorization process is impaired by irrelevant background speech. In a study published in Acoustical Science

& Technology (Vol. 35, 2014), 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. A MINITAB histogram and descriptive statistics pintout summarizing the RDER values for 71 subjects are displayed below and on the next page. Would you recommend using a normal distribution to model the distribution of RDER values? Explain.

Transcribed Image Text:

Frequency 20 18- 16- 14- 12- 10- 8- 6- Histogram of RDER 4- 2- 0 -45 -15 15 45 55 75 105 RDER Value 135 165 195 225 255