Chapter Exam

Chapter-16 Statistics — Online MCQ Test

Q: Which of the following is NOT a method of collecting data?

Answer: D. Extrapolation — Extrapolation is a method of estimating values beyond the range of collected data, not a data collection method itself.

Q: What is the median of the dataset: 3, 7, 5, 9, 2, 8, 4?

Answer: A. 5 — When arranged in order: 2, 3, 4, 5, 7, 8, 9. The median is the middle value, which is 5.

Q: A scatter diagram shows data points for variables X and Y. If points form a clear downward trend from left to right, this indicates which type of correlation?

Answer: B. Negative correlation — A downward trend indicates that as one variable increases, the other decreases, which defines negative correlation.

Q: A correlation coefficient of r = -0.92 indicates which relationship between two variables?

Answer: B. Strong negative linear relationship — A coefficient close to -1 (in this case -0.92) indicates a strong negative linear relationship, meaning as one variable increases, the other strongly decreases.

MATHS · Grade 10 · IGCSE cambridge

Practice Chapter-16 Statistics with a free chapter-wise online MCQ test for IGCSE cambridge Grade 10 MATHS. This chapter covers: Collecting and presenting data averages and spread scatter diagrams correlation and cumulative frequency.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-16 Statistics — Important Questions & Answers (FAQ)

Frequently asked questions from IGCSE cambridge Grade 10 MATHS — Chapter-16 Statistics, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is NOT a method of collecting data?

A. Questionnaire
B. Interview
C. Observation
D. Extrapolation ✓

Answer: D. Extrapolation
Extrapolation is a method of estimating values beyond the range of collected data, not a data collection method itself.

What is the median of the dataset: 3, 7, 5, 9, 2, 8, 4?

A. 5 ✓
B. 6
C. 7
D. 8

Answer: A. 5
When arranged in order: 2, 3, 4, 5, 7, 8, 9. The median is the middle value, which is 5.

A scatter diagram shows data points for variables X and Y. If points form a clear downward trend from left to right, this indicates which type of correlation?

A. Positive correlation
B. Negative correlation ✓
C. No correlation
D. Perfect correlation

Answer: B. Negative correlation
A downward trend indicates that as one variable increases, the other decreases, which defines negative correlation.

A correlation coefficient of r = -0.92 indicates which relationship between two variables?

A. Weak positive linear relationship
B. Strong negative linear relationship ✓
C. Weak negative linear relationship
D. No relationship

Answer: B. Strong negative linear relationship
A coefficient close to -1 (in this case -0.92) indicates a strong negative linear relationship, meaning as one variable increases, the other strongly decreases.

A biased sample is collected by surveying only students who use the school library. Which sampling method is being used, and why might this introduce bias?

A. Stratified sampling; it excludes students who don't use the library
B. Systematic sampling; it uses a fixed interval selection
C. Convenience sampling; it targets an easily accessible but non-representative group ✓
D. Cluster sampling; it divides the population into unequal groups

Answer: C. Convenience sampling; it targets an easily accessible but non-representative group
Surveying only library users is convenience sampling, which introduces bias because library users may have different characteristics (e.g., more academically motivated) than the general student population.