Chapter-16 Statistics — Online MCQ Test
MATHS · Grade 10 · IGCSE cambridge
Practice Chapter-16 Statistics with a free chapter-wise online MCQ test.
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.
Chapter-16 Statistics — Important Questions & Answers
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.
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.
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 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 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.
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.