1
Data Science
Unit 1 - Use of Statistics in Data Science
255+ practice questions available
Sample Practice Questions
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1
Easy
Variance is measured in:
AOriginal units
BSquared units
CNo units
DPercentage
2
Medium
If the data is highly skewed, you should report:
AMean and standard deviation
BMedian and IQR (or MAD)
CMode only
DRange only
3
Medium
Variance of {3, 5, 7} (population). Mean = 5.
A2
B8/3 ≈ 2.67
C4
D6
4
Medium
If two datasets X and Y have the same mean but Y has higher σ, the data in Y is:
AMore clustered around the mean
BMore spread around the mean
CSame as X
DSmaller
5
Hard
Trimmed mean of 10% from {1, 2, 3, 4, 100} (10% = 1 from each end). New mean is:
AMean of {1,2,3,4,100} = 22
BMean of {2,3,4} = 3
CMedian = 3
DMode
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