The graph shows the effect of voters' previously stated preference regarding the issue of working-time reduction on the probability of...
GMAT Graphics Interpretation : (GI) Questions

The graph shows the effect of voters' previously stated preference regarding the issue of working-time reduction on the probability of those voters' actual choice being the same as that stated preference. For each party shown in the graph, less than 10% of that party's voters had a previously stated preference against the issue. Using the drop-down menus, fill in the blanks to make the most accurate statements based on the graph.
Owning the Dataset
Table 1: Text Analysis
Component | Content |
---|---|
Main Subject | The effect of voters' prior stated preference on the chance their actual vote will match that preference. |
Issue | Working-time reduction. |
Data Constraint | For each party, less than 10% of that party's voters had a previous preference against the issue. |
Variable Measured | Probability that a voter's choice matches their original preference regarding working-time reduction. |
Table 2: Chart Analysis
Component | Description |
---|---|
X-axis | Issue preference: 5 levels from 'against' to 'for'. |
Y-axis | Probability (0.00–0.90): Likelihood actual vote matches prior stated preference. |
Series | 5 parties: Delta, Sigma, Theta, Zeta, No Preference (each with a line across preference spectrum). |
Delta | Upward trend: 0.60 (against) to 0.81 (for). |
Sigma | Flat trend: 0.52–0.55 across all levels. |
Theta | Downward trend: 0.60 (against) to 0.42 (for). |
Zeta | Downward trend: 0.70 (against) to 0.47 (for). |
No Preference | Slight upward trend: 0.48 (against) to 0.57 (for). |
Key Insights
- Delta party voters are most likely to follow their prior preference if it was pro working-time reduction (0.81 probability).
- Zeta and Theta party voters are most likely to stick with a stated preference against, but show lower consistency as preference becomes more favorable.
- For all parties, the fraction of voters who were originally against working-time reduction is less than 10%.
- Sigma party voters show consistent behavior regardless of stated preference, while most other parties show the probability is related to the strength/direction of the original preference.
Step-by-Step Solution
Question 1: Party Most Likely to Vote According to Preference
Complete Statement:
Members of the ______ party are most apt to vote according to their previously stated preference regarding the issue of working-time reduction.
Breaking Down the Statement
Statement Breakdown 1:
- Key Phrase: most apt to vote according to their previously stated preference
- Meaning: This asks which party has the highest probability that members will vote in line with what they previously said about the issue.
- Relation to Chart: The chart shows, for each party and each preference position, how likely a member is to vote matching their stated preference.
- Important Implications: We need to look across the whole chart and select the party that has the overall highest and most consistent probabilities of matching votes to preferences.
Statement Breakdown 2:
- Key Phrase: regarding the issue of working-time reduction
- Meaning: The chart and question both focus on reducing working time.
- Relation to Chart: The entire x-axis of the chart is people's stated preference for or against working-time reduction.
- Important Implications: All data points and analysis strictly concern the working-time reduction issue, not any other topic.
What is needed: We need to determine which party's members most consistently vote according to their prior preference, considering all positions from 'against' to 'for'.
Solution:
Condensed Solution Implementation:
Scan each party's line in the chart for values and trends. Identify the party with the highest and most consistently high probabilities for matching their vote with prior preference.
Necessary Data points:
Delta: 0.60 to 0.81 (increases). Sigma: about 0.53-0.55 (flat). Theta: 0.60 to 0.42 (decreases). Zeta: 0.70 to 0.47 (decreases). No preference: about 0.48.
- Calculations Estimations: Delta starts at 0.60 and rises to 0.81, showing both the highest values and a rising trend. The other parties either decline or remain flat, and their probabilities never reach Delta's high point.
- Comparison to Answer Choices: Compared to the alternatives, Delta is most apt since it reaches the highest probability (0.81) and has the strongest upward trend.
FINAL ANSWER Blank 1: Delta
Question 2: Party Most Likely to Vote Against When Preference Was Against
Complete Statement:
Members of the ______ party are most apt to vote against the issue of working-time reduction if their previously stated preference regarding the issue of working-time reduction was also against.
Breaking Down the Statement
Statement Breakdown 1:
- Key Phrase: most apt to vote against the issue
- Meaning: We're focusing on which party's members most often actually vote 'against' the policy.
- Relation to Chart: This is the probability shown for each party at the 'against' point on the x-axis, reflecting those who stated opposition and then voted that way.
Statement Breakdown 2:
- Key Phrase: if their previously stated preference...was also against
- Meaning: Look specifically at people who had previously said they were against the reduction.
- Relation to Chart: Find the leftmost data point for each party, corresponding to 'against' on the x-axis.
What is needed: Which party has the highest probability at the 'against' position, indicating the most reliable follow-through on stated opposition.
Solution:
Condensed Solution Implementation:
Directly compare the values at the 'against' x-axis point for all parties and select the highest.
Necessary Data points:
Against position: Delta 0.60, Sigma 0.54, Theta 0.60, Zeta 0.70, No preference: 0.48.
- Calculations Estimations: Zeta has the highest single value at the 'against' position—0.70, more than any other party.
- Comparison to Answer Choices: Zeta stands out above all others at this specific point, so it is the correct answer.
FINAL ANSWER Blank 2: Zeta
Summary
To answer both blanks, we compared probabilities shown on the party lines in the chart. Delta shows the most overall reliability in matching votes to preferences, especially as support for the issue increases. For those who originally opposed working-time reduction, Zeta party members are most likely to follow through and vote against, as shown by their high probability in the leftmost data point.
Question Independence Analysis
The two blanks are independent. The first is about overall match between preference and voting behavior across the entire scale, while the second only targets votes of those who were originally against. Each requires examining a different part of the chart.