2024497001_mcq-1.docx

**Kwangwoon University Specialized Graduate School** **School of Smart Convergence** **Data Science (1) Final Examination (Multiple choice)** **데이터분석(1), 2024년 1학기** Submission on 12 June, 2024 **Multiple-Choice Part:** 10 questions in English. Only one single solution! (20 points) *...

**Kwangwoon University Specialized Graduate School** **School of Smart Convergence** **Data Science (1) Final Examination (Multiple choice)** **데이터분석(1), 2024년 1학기** Submission on 12 June, 2024 **Multiple-Choice Part:** 10 questions in English. Only one single solution! (20 points) **** **** **** **** **** **** **** **** **** **** --------------------- --------------------- --------------------- --------------------- --------------------- --------------------- --------------------- --------------------- --------------------- ---------------------- A A A A A A A A A A B B B B B B B B B B C C C C C C C C C C D D D D D D D D D D 1. **Vector. Select the wrong one.** A. Vectors are broken into large lists, which are common members of the vector. B. A vector is defined as an object with both magnitude and direction. C. The vector could be for us simply a 1-dimensional array representing a series of numbers. D. Vectors are broken into components, which are individual members of the vector. 2. **Vectors and matrices. Select the correct one.** A. If a matrix has the same number of rows and columns, it is called a square matrix. B. To represent data in multiple dimensions we can extend our notion of an array by using a vector. C. A matrix is a 1-dimensional representation of arrays of numbers. D. A vector is a 2-dimensional array representing a random series of numbers. 3. **Arithmetic symbols. Select the wrong one.** A. ∑ symbol is a universal symbol for addition. B. In proportion, values can vary directly but never indirectly. C. ∝ represents values that are proportional to each other. D. On the right side of ∑ symbol is usually something iterable. 4. **Graphs. Select the wrong one.** A. An exponent tells you how many times you have to multiply a number to itself. B. In case of graphs, sometimes we refer to the 𝑥 variable as being the independent variable and the 𝑦 as the dependent variable. C. The slope defines the rate of change among a large number of points. D. If some quantity is growing (or declining in growth), an exponent/logarithm can help model this behavior. 5. **The set theory. Select the correct one.** A. The set theory involves mathematical operations at a logarithmic level. B. A set is a collection of similar objects. C. An array in python is a set of key-indexed pairs. D. A set can be thought of as a list in Python, but with no repeat objects. 6. **The set theory. Select the correct one.** A. The magnitude of a set is the number of elements in the set multiplied by the total number of elements. B. To denote that an element is within a set: 2.5∩{1,2,3} C. In case of 𝐴⊆𝐵, A is a subset of B and B is called the superset of A. D. If A is a subset of B but A equals B, then A is called a perfect subset of B. 7. **Matrix multiplication rules. Select the correct one.** A. Multiplication of matrices is commutative. B. You can multiple matrices together if the second number in the first dimension pair is the same as the first number in the second dimension pair. C. In order to multiply matrices, their dimensions do not have to match up. D. The resulting matrix will usually have dimensions equal to the outer numbers in the dimension pairs. 8. **Comparing vectors in R. Select the wrong one.** A. You can never compare a vector against a single scalar. B. The comparison operators (==, !=, \, \=) can perform an element-by-element comparison of two vectors. C. The comperison operators (==, !=, \, \=) can also compare a vector's element against a scalar. D. R's two logical values, TRUE and FALSE are often called Boolean values in python. 9. **To extract one or more elements from a vector:** A. Use negative indexes to exclude elements. B. Use parentheses to select vector elements by their position, such as v\[3\] for the third element of v. C. Use a vector of indexes to select a single value. D. Use matrix multiplication to select elements based on a condition. 10. **Probability definition. Select the wrong one.** A. A procedure is an act that leads to a result. B. An event is a collection of the outcomes of a procedure. C. A simple event is an outcome/event of a procedure that cannot be broken down further. D. The two-dimensional space of a procedure is the set of a few simple and many of the complex events.