LSAT 149 – Section 3 – Question 21
LSAT 149 - Section 3 - Question 21
December 2017You need a full course to see this video. Enroll now and get started in less than a minute.
Target time: 1:44
This is question data from the 7Sage LSAT Scorer. You can score your LSATs, track your results, and analyze your performance with pretty charts and vital statistics - all with a Free Account ← sign up in less than 10 seconds
Question QuickView |
Type | Tags | Answer Choices |
Curve | Question Difficulty |
Psg/Game/S Difficulty |
Explanation |
---|---|---|---|---|---|---|---|
PT149 S3 Q21 |
+LR
| Must be true +MBT Quantifier +Quant Math +Math | A
24%
161
B
5%
156
C
6%
157
D
55%
166
E
10%
157
|
152 161 170 |
+Hardest | 147.456 +SubsectionMedium |
Summary
Images shown to subjects in an experiment usually showed up at the top of the screen but sometimes showed up at the bottom.
When asked to guess where the next image would appear, the subjects were correct less than half of the time.
Their guesses were based on patterns they thought they saw.
If they always guessed that the image would show up at the top, they would guess correctly most of the time.
When asked to guess where the next image would appear, the subjects were correct less than half of the time.
Their guesses were based on patterns they thought they saw.
If they always guessed that the image would show up at the top, they would guess correctly most of the time.
Notable Valid Inferences
The images showed up at the top of the screen over 50% of the time.
A
If the subjects had always guessed that the next image would appear at the top, they would not have been basing their guesses on any pattern they believed they saw in the sequence.
Could be false. It could be that the strategy of always guessing that the images would be at the top came from repeatedly observing the image at the top. In the world where the subjects were always guessing top, we don’t have the information to say what this guess was based on.
B
Basing one’s guesses about what will happen next on the basis of patterns one believes one sees is less likely to lead to correct guesses than always guessing that what has happened before will happen next.
Could be false. (B) compares the strategy that the subjects used (basing guesses on perceived patterns) with a strategy that is not mentioned in the stimulus, so we cannot say which of these strategies is more likely to lead to correct guesses.
C
There was no predictable pattern that one could reasonably believe occurred in the series of images on the computer screen.
Could be false. It could be the case that there was a predictable pattern, but that the subjects didn’t pick up on it quickly enough to guess correctly a majority of the time.
D
Some of the subjects sometimes guessed that the next image would appear at the bottom of the computer screen, but were incorrect.
Must be true. Since subjects guessed correctly less than half of the time but would have been right most of the time by always choosing "top," they must have sometimes guessed "bottom" and been wrong. Otherwise, their accuracy wouldn’t be below 50%.
E
The most rational strategy for guessing correctly where the next image would appear would have been simply to always guess that the image would appear at the top.
Could be false. While we know that always guessing top would be more accurate than the strategy that the subjects used, we don’t know that always guessing top would be the most accurate strategy. There could have been other, more accurate, strategies.
Take PrepTest
Review Results
LSAT PrepTest 149 Explanations
Section 1 - Logical Reasoning
- Question 01
- Question 02
- Question 03
- Question 04
- Question 05
- Question 06
- Question 07
- Question 08
- Question 09
- Question 10
- Question 11
- Question 12
- Question 13
- Question 14
- Question 15
- Question 16
- Question 17
- Question 18
- Question 19
- Question 20
- Question 21
- Question 22
- Question 23
- Question 24
- Question 25
Section 2 - Reading Comprehension
- Passage 1 – Passage
- Passage 1 – Questions
- Passage 2 – Passage
- Passage 2 – Questions
- Passage 3 – Passage
- Passage 3 – Questions
- Passage 4 – Passage
- Passage 4 – Questions
Section 3 - Logical Reasoning
- Question 01
- Question 02
- Question 03
- Question 04
- Question 05
- Question 06
- Question 07
- Question 08
- Question 09
- Question 10
- Question 11
- Question 12
- Question 13
- Question 14
- Question 15
- Question 16
- Question 17
- Question 18
- Question 19
- Question 20
- Question 21
- Question 22
- Question 23
- Question 24
- Question 25
- Question 26
Leave a Reply
You must be logged in to post a comment. You can get a free account here.