WorksheetsStatistics for ML
Total questions: 20
Worksheet time: 7mins
What is the mean of the numbers: 2, 4, 6, 8, 10?
5
6
7
8
What does standard deviation measure?
Central value
Frequency
Spread of data
Correlation
Which of the following is NOT a measure of central tendency?
Mean
Median
Mode
Variance
What is the correlation coefficient range?
0 to 1
-1 to 1
-∞ to +∞
0 to ∞
What is the median of the dataset: 1, 3, 5, 7, 9, 11?
5
6
7
8
What is the mode of the dataset: 2, 4, 4, 6, 8,6,6,6,4,8,8,4,3,5,4?
4
6
8
3
Which of the following best describes a symmetric distribution?
Left-skewed
Right-skewed
Bell-shaped
Flat
What is the range of the dataset: 15, 30, 20 ,10, 15,25
15
20
25
10
Which term describes how much values differ from the mean?
Median
Mode
Frequency
Variance
Which of the following statistics is not affected by extreme values?
Mean
Standard deviation
Median
Range
If correlation is 0, what does it mean?
Strong relationship
No linear relationship
Perfect relationship
Data is identical
What is a population in statistics?
A small sample of data
The average value of a dataset
The number of unique values
The total set of items being studied
The difference between the highest and lowest value in a dataset is called:
Standard deviation
Variance
Range
Mode
What does a high standard deviation indicate?
Data points are spread out from the mean
Data points are close to the mean
Data is very consistent
All values are the same
. In a perfectly symmetric normal distribution, the mean, median, and mode are:
All different
Not defined
All equal
Always integer
What does the term "outlier" refer to in statistics?
A missing value
A value that lies far from other values
A common data point
A calculated average
If the data is negatively skewed, the mean is usually:
Not related to the median
Greater than the median
Less than the median
Equal to the median
Which metric is suitable for evaluating classification models when dealing with imbalanced datasets?
Accuracy
F1 Score
Recall
Precision
Which test is used to check independence between two categorical variables?
Z-test
ANOVA
Chi-square test
t-test
What does a small p-value (e.g., p < 0.05) typically suggest?
Accept null hypothesis
Data has outliers
Mean is high
Reject null hypothesis
