1.

Consider the stem-and-leaf display to the right. Stem a. How many observations were in the original data set? b. In the bottom row of the stem-and-leaf display, identify the stem, the leaves, and the numbers in the original data set represented by this stem and its leaves. c. Re-create all the numbers in the data set and construct a dot plot. O = N W a. How many observations were in the original data set? There were D observations in the original data set. Leaf 299 A777 6678 036 In a psychological study of short-term memory, irrelevant speech effects refer to the degree to which the memarization 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 conditionscalled the relative difference in error rate (RDER)was computed for each subject. A histogram summarizing the RDER values for 81 subjects is displayed to the right. Complete parts a through below. 12 ==] Frequency S -5 15 105 195 285 LR a. Convert the frequency histogram into a relative frequency histogram. Choose the correct graph below. O A. B. O C. O D. Q Q Q Q S} o} o M3 o o [} uency