The document contains a surprise test with 16 multiple choice or short answer questions about key statistical concepts like measures of central tendency, probability, correlation, and regression. The questions cover topics like the probability of choosing a consonant, identifying the mode, median, and mean in data sets, interpreting scatter plots, and defining the components in a simple linear regression equation. The test is identified as belonging to a student named Md. Mortuza Ahmmed.

1. Surprise test
Section ID Name Marks
1. What is the probability of choosing a consonant from the alphabet? _______
2. The observation which occurs most frequently in a sample is the _____________
3. What is the median of the sample 5, 5, 11, 9, 8, 5, 8? ________
4. A graph that uses vertical bars to represent data is called a ______________________
5. As a general rule, the ____________is the best measure of central tendency.
6. The _____________ is the value you calculate when you want the arithmetic average.
7. __________________________ are used when you want to visually examine the relationship
between two quantitative variables.
8. The range of the correlation coefficient is _________ to _________
9. For what value of x will 8 and x have the same mean (average) as 27 and 5? ___________
10. A disadvantage of the range is only _________ values are used in its calculation.
11. The mean deviation is based on __________________ values.
12. The standard deviation is based on ________________deviations from the mean.
13. The standard deviation can never be _______________________
14. We can get variance by _____________________ standard deviation.
15. Y = 5 + 2X. Interpret α and β.
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16. How many dependent variables are used in multiple regression models? _____________
Md. Mortuza Ahmmed