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Question: in a psychological study of shortterm memory irrelevant speech effects...

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In a psychological study of short-term memory, irrelevant speech effects refer to the degree to which the memorization process is impaired by irrelevant background speech. An analysis of irrelevant speech effects was carried out and published. Subjects performed the 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 histogram summarizing the RDER values for 76 subjects is displayed to the right. Complete parts a through c below. 75 15 105 195 285 RDER Value a. Convert the frequency histogram into a relative frequency histogram. Choose the correct graph below OA. OC. 0.1 0.1 0.2 45 165 RDER Value 45 165 285 RDER Value 5 45 165 45 165 2 RDER Value RDER Value Enter your answer in the answer box and then click Check Answerb. What proportion of the subjects had RDER values between 75 and 105? The proportion of the subjects that had RDER values between 75 and 105 is 211 Round to three decimal places as needed.) C. What proportion of the subjects had RDER values below 15? The proportion of the subjects that had RDER values below 15 is (Round to three decimal places as needed.)

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