| Females | ||
| Age | No. of subjects | No. of judgments |
| 17 yrs. | 73 | 1160 |
| 18 | 57 | 911 |
| 19 | 64 | 1024 |
| 20 | 80 | 1280 |
| Totals | 274 | 4375 |
| Interval | No. of judgments | |
| 18" | 1092 | |
| 36" | 1094 | |
| 72" | 1096 | |
| 108" | 1093 | |
| Total | 4375 | |
A general survey of the individual records, all of which for any one year and sex were tabulated, for convenience of examination, on a single large sheet of coördinate paper, showed that the judgments vary within a wide range and are very inexact. Table 2 exhibits the number of correct judgments for each sex, interval, and filling. Of the 4014 male judgments only 96 (2.39%) were correct; of the 4375 female judgments only 46 (1.05%) were correct. The number of correct judgments decreases as the length of the interval increases. For the 18-second intervals there were 7.37% for the males, 2.48% for the females, while for the 108-second intervals there were only 0.10% and 0.37% respectively.
TABLE 2
FREQUENCY OF OCCURRENCE OF CORRECT JUDGMENTS
| Males | ||||||||||||||||||
| 18˝ | 36˝ | 72˝ | 108˝ | |||||||||||||||
| I | E | R | W | I | E | R | W | I | E | R | W | I | E | R | W | Σ | % | |
| 29 | 26 | 11 | 8 | 5 | 6 | 3 | 0 | 3 | 3 | 0 | 1 | 0 | 1 | 0 | 0 | 96 | 2.39 | |
| Totals 74 = 7.37% | 14 = 1.40% | 7 = 0.70% | 1 =0.10% | 96 | 2.39 | |||||||||||||
| Females | ||||||||||||||||||
| 7 | 15 | 1 | 4 | 2 | 4 | 1 | 0 | 2 | 5 | 0 | 1 | 2 | 1 | 0 | 1 | 46 | 1.05 | |
| Totals 27 = 2.48% | 7 = 0.62% | 8 = 0.73% | 4 = 0.37% | 46 | 1.05 | |||||||||||||
List of abbreviations which occur in the tables.
Σ always designates the sum of the results of the column which it heads.
I, E, R, W refer respectively to the intervals of idleness, estimating, reading, and writing.
The % sign refers to the value of the result in question in terms of the total number of judgments.
C refers to the results of the letter-counting test.
The male judgments for the 108-second intervals range from 11 to 300 seconds. If random guesses be made within these limits the probability of the occurrence of right guesses (108˝) would be 1 in 290; therefore among 1004 guesses (the number of male judgments for 108-second intervals) 3.5 would be right. In the experiment only one judgment of the 1004 was correct. For the other intervals, with the exception of 18 seconds, the number of correct judgments is only slightly greater than random guessing would have given. Both males and females, however, show considerably more correct judgments for 18-second intervals than the number of probable right guesses. Within the range of the male judgments and for their number 16.9 right guesses might be expected, for the females 10.9. In contrast with these numbers the experiments furnished 74 and 27 correct judgments respectively.
It is noteworthy that for those intervals which are most frequently correctly judged, not only is the number of correct judgments greater for the males than for the females (the ratio of the percentages is about 3 to 1), but the ratio of the number of correct judgments to the probable number of right guesses is also greater for the males.
The female judgments vary within a wider range and are less often correct than the male. For the latter the total number of correct judgments is more than twice that for the former.
Another interesting fact concerning the judgments of the time-intervals is that certain numerals occur in the last place of a judgment more frequently than we should expect if their occurrence depended on random guessing. Tables 3 and 4 exhibit the results of an analysis of the data made for the purpose of studying this fact. In Table 3 the frequency of occurrence of the digits 0, 1, 2, 3, etc., in the last place of the male judgments is given for each filling under the four intervals. For example, the digit 0 occurred in the last place of the male judgments for the interval reading 36 seconds 98 times, as we learn by referring to the first line and third row of the second column of Table 3.