Chapter 13 Quiz: Goalkeeper Analysis

Instructions

This quiz contains 30 questions testing your understanding of goalkeeper analysis. Select the best answer for each multiple-choice question.

Time Limit: 45 minutes Passing Score: 70% (21/30)

Section A: Shot-Stopping Fundamentals (Questions 1-10)

Question 1

What is the primary limitation of using raw save percentage to evaluate goalkeepers?

a) It doesn't account for the goalkeeper's age b) It treats all shots equally regardless of difficulty c) It requires too much data to calculate d) It doesn't include penalties

Question 2

Post-Shot Expected Goals (PSxG) differs from standard xG by incorporating:

a) Goalkeeper positioning before the shot b) Shot placement within the goal frame c) Team defensive formation d) Weather conditions

Question 3

A goalkeeper faces 50 shots on target worth 8.0 PSxG and concedes 4 goals. What is their goals prevented value?

a) -2.0 b) +2.0 c) +4.0 d) +8.0

Question 4

Which statement about goalkeeper sample sizes is TRUE?

a) Save percentage stabilizes after approximately 50 shots b) Goalkeepers generate similar data volumes to midfielders c) A full season provides adequate data for reliable evaluation d) Approximately 200-300 shots are needed for stable save statistics

Question 5

When evaluating a goalkeeper, a negative goals prevented value indicates:

a) The goalkeeper made more saves than expected b) The goalkeeper conceded more goals than expected c) The defense allowed too many shots d) The data is insufficient for analysis

Question 6

Calculate save percentage: 120 shots on target, 95 saves.

a) 79.2% b) 80.0% c) 126.3% d) 22.8%

Question 7

Which zone typically presents shots with the highest xG?

a) Outside the box b) Inside box - wide areas c) Inside box - central d) Free kick positions

Question 8

A Bayesian approach to save percentage is useful because it:

a) Eliminates all uncertainty b) Incorporates prior information to improve small-sample estimates c) Is faster to calculate than traditional methods d) Works without any match data

Question 9

What does a 95% confidence interval for save percentage represent?

a) The goalkeeper will save 95% of shots b) There is a 95% chance the true save percentage falls within the interval c) The estimate is 95% accurate d) 95% of goalkeepers fall within this range

Question 10

Which metric is MOST appropriate for comparing goalkeepers on teams with different defensive qualities?

a) Total goals conceded b) Clean sheets c) Goals prevented (xG - goals conceded) d) Number of saves

Section B: Distribution Analysis (Questions 11-15)

Question 11

A "build-out" goalkeeper is characterized by:

a) High percentage of long kicks b) High pass completion with short/medium passes c) Many punches on crosses d) Aggressive positioning off the line

Question 12

Calculate progressive pass percentage: 60 total passes, 18 progress the ball >10m forward.

a) 10% b) 18% c) 30% d) 33%

Question 13

Which metric best captures a goalkeeper's contribution to attacking play?

a) Save percentage b) Goals prevented c) Progressive passes and pass completion d) Clean sheets

Question 14

Goal kick analysis should consider:

a) Only success rate b) Short vs. long ratio and success rate by type c) Only distance achieved d) Number of goal kicks taken

Question 15

A goalkeeper with 85% pass success and 60% long pass ratio would be classified as:

a) Build-out specialist b) Balanced distributor c) Launcher d) Cannot be determined

Section C: Sweeper-Keeper Metrics (Questions 16-20)

Question 16

"Sweeper actions" typically include:

a) Saves and punches only b) Recoveries, clearances, and interceptions outside the box c) All goalkeeper touches d) Penalty saves

Question 17

A high claim rate on crosses indicates:

a) The goalkeeper is reluctant to come for crosses b) The goalkeeper dominates aerial duels in the box c) The defense is weak at heading d) The opposition crosses frequently

Question 18

Which scenario most requires sweeper-keeper ability?

a) Team plays deep defensive line b) Team plays high defensive line c) Team uses long ball tactics d) Team has strong central defenders

Question 19

A goalkeeper who frequently comes off the line but has poor decision-making would show:

a) High sweeper actions, high success rate b) High sweeper actions, low success rate c) Low sweeper actions, high success rate d) Low sweeper actions, low success rate

Question 20

Aerial win percentage for a goalkeeper should be compared to:

a) Outfield player averages b) Other goalkeepers c) Center-back averages d) League save percentage

Section D: Comprehensive Evaluation (Questions 21-25)

Question 21

A complete goalkeeper profile should include:

a) Shot-stopping metrics only b) Shot-stopping, distribution, and sweeper metrics c) Only statistics that favor the goalkeeper d) Comparison to the team's previous goalkeeper

Question 22

When evaluating a goalkeeper for a possession-based team, which metric should receive the HIGHEST weight?

a) Aerial win rate b) Long kick accuracy c) Pass completion and progressive distribution d) Shot block rate

Question 23

Which combination of metrics best identifies an elite modern goalkeeper?

a) High save percentage, high long pass rate b) High goals prevented, high pass completion, moderate sweeper actions c) Maximum sweeper actions, any save percentage d) Clean sheets only

Question 24

In a recruitment scenario, why is it important to consider confidence intervals?

a) They make reports look more professional b) They reveal whether observed differences might be due to chance c) They are required by regulatory bodies d) They eliminate the need for additional scouting

Question 25

A goalkeeper with +7.0 goals prevented over 30 matches is:

a) Definitely elite quality b) Probably performing above average but sample size limits certainty c) Average performer d) Definitely poor quality

Section E: Practical Application (Questions 26-30)

Question 26

When presenting goalkeeper analysis to coaching staff, the MOST important consideration is:

a) Including as many metrics as possible b) Communicating uncertainty and actionable insights clearly c) Using complex statistical terminology d) Focusing only on comparison to the best goalkeeper

Question 27

A goalkeeper's save percentage drops from 75% to 68% after 10 matches. What should an analyst conclude?

a) The goalkeeper has significantly declined b) The change is likely within normal variance and requires more data c) The defense has improved d) The goalkeeper should be replaced immediately

Question 28

Which visualization is MOST effective for showing goalkeeper shot-stopping performance?

a) Pie chart of outcomes b) Shot map with outcomes and xG values c) Bar chart of save counts d) Line graph of goals conceded

Question 29

For opposition analysis, which goalkeeper metrics are MOST relevant?

a) Historical save percentage only b) Distribution patterns and claiming tendencies c) Goals prevented from last season d) Market value

Question 30

The primary challenge in comparing goalkeepers across different leagues is:

a) Data format differences b) Shot quality and volume differences between leagues c) Language barriers d) Time zone differences

Answer Key

1. b - Save percentage treats all shots equally regardless of difficulty, failing to account for shot quality differences.

2. b - PSxG incorporates shot placement within the goal frame to estimate save difficulty.

3. b - Goals Prevented = PSxG - Goals Conceded = 8.0 - 4.0 = +2.0

4. d - Research indicates approximately 200-300 shots are needed for save statistics to stabilize.

5. b - Negative goals prevented means the goalkeeper conceded more goals than expected based on shot quality.

6. a - Save % = 95/120 = 79.2%

7. c - Inside box central shots typically have the highest xG due to proximity and angle to goal.

8. b - Bayesian methods incorporate prior information to improve estimates when sample sizes are small.

9. b - A 95% CI means there's a 95% probability the true parameter falls within the interval.

10. c - Goals prevented adjusts for shot quality, enabling fair comparison across defensive contexts.

11. b - Build-out goalkeepers are characterized by high pass completion with short/medium passes.

12. c - Progressive % = 18/60 = 30%

13. c - Progressive passes and pass completion capture attacking contribution through distribution.

14. b - Goal kick analysis should examine both the short/long ratio and success rates by type.

15. c - 60% long pass ratio with 85% success indicates a "Launcher" style.

16. b - Sweeper actions include recoveries, clearances, and interceptions outside the penalty box.

17. b - High claim rate indicates dominance in aerial duels within the box.

18. b - High defensive lines create space behind that requires sweeper-keeper coverage.

19. b - Frequent but unsuccessful sweeping attempts indicate high activity but poor decision-making.

20. b - Goalkeeper aerial metrics should be compared to other goalkeepers due to role-specific context.

21. b - Complete profiles require shot-stopping, distribution, and sweeper metrics.

22. c - Possession-based teams prioritize pass completion and progressive distribution.

23. b - Elite modern goalkeepers combine shot-stopping, distribution, and appropriate sweeping.

24. b - Confidence intervals reveal whether differences might be due to statistical chance.

25. b - +7.0 goals prevented over 30 matches suggests above-average performance but with uncertainty.

26. b - Clear communication of uncertainty and actionable insights is most important.

27. b - A 10-match sample is too small; the change is likely within normal variance.

28. b - Shot maps showing outcomes and xG values provide comprehensive visual information.

29. b - Distribution patterns and claiming tendencies are most relevant for opposition exploitation.

30. b - Shot quality and volume differences make cross-league comparison challenging.

Score Interpretation

Concepts to Review by Section

Section A (1-10): Focus on PSxG concept and goals prevented calculation.

Section B (11-15): Review distribution style classification and progressive metrics.

Section C (16-20): Study sweeper-keeper requirements and aerial analysis.

Section D (21-25): Focus on comprehensive evaluation and uncertainty communication.

Section E (26-30): Review practical application and presentation guidelines.