Math's Grade 12 Unit 3
#5 Mcq with answer

1. Which statement about random sampling is FALSE?
A) It minimizes investigator bias. 
B) It ensures proportional representation of subgroups. 
C) It requires careful planning. 
D) It applies to any population type.

2. If a new value equal to the mean is added to a dataset, which statement is true? 
A) Mean increases, standard deviation decreases. 
B) Mean stays the same, standard deviation decreases. 
C) Mean stays the same, standard deviation increases. 
D) Mean and standard deviation remain unchanged. 

3. In a distribution where Mean = 12, Median = 14, Mode = 16, the skewness is: 
A) Positively skewed 
B) Symmetrical
C) Negatively skewed   
D) Not determinable 

4. If all values in a dataset are multiplied by 3, the variance becomes: 
A) 3 times the original 
B) 9 times the original 
C) Unchanged 
D) √3 times the original 

5. Which sampling method divides the population into homogeneous subgroups? 
A) Simple random sampling 
B) Cluster sampling 
C) Stratified sampling 
D) Systematic sampling 

Answer
1. B
2. B
3. C
4. B
5. C

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