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| Section | Objectives |
|---|---|
| Basic Program Design | - Use functions, methods, and packages to leverage programming language - Explain how to store, access, and manipulate data in lists - Identify variables and data types within a programming language |
| Data Profiling | - Apply fundamental concepts and subsetting techniques to a dataset - Utilize a programming language to manipulate arrays and discover insights |
| Algorithm Efficiency | - Choose an appropriate sorting algorithm method based on a given scenario - Describe the relationships between algorithm complexity and data structures - Choose an appropriate algorithm searching method based on a given scenario |
| OS Fundamentals | - Identify common privacy and security concepts that could be implemented in operating systems - Demonstrate various techniques and tools to manage operating systems - Describe fundamental principles and core concepts of operating systems |
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NEW QUESTION # 51
Which character is used to indicate a range of values to be sliced into a new list?
Answer: D
Explanation:
In Python, slicing is the standard mechanism for extracting arangeof elements from a sequence type such as a list, string, or tuple. The character that signals a slice range is thecolon:. The general slice syntax is sequence
[start:stop:step]. Most commonly, you see sequence[start:stop], where start is the index to begin from (inclusive) and stop is the index to end at (exclusive). This "inclusive start, exclusive stop" rule is emphasized in textbooks because it makes slice lengths easy to reason about: when step is 1, the number of elements returned is stop - start.
For example, if items = ["a", "b", "c", "d", "e"], then items[1:4] returns ["b", "c", "d"]. Omitting start defaults to the beginning (items[:3] gives the first three elements), and omitting stop defaults to the end (items[2:] gives everything from index 2 onward). The optional step supports patterns like items[::2] for every other element, and negative steps can reverse a sequence (items[::-1]).
The other characters do not define ranges in Python slicing: , separates items (or indices in multidimensional structures), + is addition/concatenation, and = is assignment. The colon is the slicing operator that indicates a range.
NEW QUESTION # 52
What is the correct way to convert an integer to a string in Python?
Answer: B
Explanation:
Python provides built-in type conversion functions that construct a value of a target type from a supplied object when possible. To convert an integer to a string, Python uses the constructor function str(). For example, str(42) produces the string "42". This operation is fundamental in programming textbooks because it enables tasks like formatting output, concatenating numbers into messages, building file names, or preparing numeric values for text-based storage and transmission.
Python distinguishes clearly between numeric types (int, float) and text type (str). You cannot concatenate an integer directly with a string (e.g., "Age: " + 30 raises a TypeError) because the types are different. Using str (30) resolves this by converting the integer into its string representation: "Age: " + str(30) becomes valid.
Modern Python commonly uses f-strings (f"Age: {30}"), which perform conversion automatically, but str() remains the canonical and explicit method.
Options A, B, and C are not standard Python built-ins for conversion. While some libraries define helper functions with similar names, the language's standard approach is str(...). Textbooks also highlight that str() is not limited to integers: it can convert many objects into readable string representations, often by invoking the object's __str__ method. This ties conversion to Python's object model and supports consistent display and logging across programs.
NEW QUESTION # 53
What statistical measure can be used to detect outliers in a dataset using NumPy?
Answer: C
Explanation:
Outlier detection often relies on measuring how far values deviate from a "typical" center. While variance and standard deviation can be used in simple z-score based methods, they arenot robust: a few extreme outliers can inflate the mean and standard deviation, masking the very outliers you want to find. A widely taught robust alternative is themedian absolute deviation (MAD), which is based on the median rather than the mean and therefore resists distortion by extreme values.
MAD is computed by first taking the median of the data, then computing the absolute deviation of each point from that median, and finally taking the median of those deviations. Because medians are stable under extreme values, MAD provides a strong baseline for identifying unusually distant points. Many textbooks and data analysis references present MAD as a robust scale estimator for outlier detection, often combined with a threshold rule such as flagging points whose deviation exceeds a constant multiple of MAD (with a scaling factor sometimes used to make it comparable to standard deviation under normality assumptions).
In NumPy, you can implement MAD using np.median() and np.abs(). Mode is generally not useful for continuous numeric outlier detection, and variance/standard deviation are more sensitive to outliers than MAD. Thus, among the given options, the best statistical measure for detecting outliers robustly is the median absolute deviation.
NEW QUESTION # 54
How can someone subset the last two rows and columns of a 2D NumPy array?
Answer: B
Explanation:
NumPy slicing uses the same start/stop rules as Python sequences, and it also supports negative indices to count from the end. In a 2D array, slicing is written as array[rows, columns]. To get thelast two rows, you use
-2: in the row position, meaning "start two rows from the end and go to the end." Similarly, to get thelast two columns, you use -2: in the column position. Combining these gives array[-2:, -2:], which selects the bottom- right 2×2 subarray.
Option A, array[-2:, :], selects the last two rows butall columns, so it is not restricted to the last two columns.
Option D, array[:, -2:], selects all rows but only the last two columns. Option B, array[-1:, -1:], selects only the last row and the last column, producing a 1×1 (or 1×1 view) subarray, not a 2×2.
This kind of slicing is widely taught because it is essential for matrix operations, extracting submatrices, working with sliding windows, and manipulating image or time-series data where "take the last k observations/features" is common. Negative indexing reduces errors and makes code clearer, especially compared with computing explicit indices like array[rows-2:rows, cols-2:cols].
NEW QUESTION # 55
Which type of data structure is the only focus of a binary search?
Answer: B
Explanation:
Binary search is designed for searching in asorted (ordered) sequence. Its efficiency comes from repeatedly comparing the target to the middle element and discarding half of the remaining search space. This halving logic only works when the data is ordered, because the algorithm relies on the guarantee that all elements on one side of the midpoint are smaller (or larger) than the midpoint. In textbooks, this requirement is stated explicitly: binary search assumes the collection is sorted according to the same ordering used for comparisons.
An "ordered list" is therefore the correct focus among the options. Binary search can be implemented on arrays or other random-access structures where you can quickly access the middle element by index. While you can conceptually perform binary search on a linked list, it becomes inefficient because finding the middle requires linear traversal, losing the O(log n) advantage. Stacks and queues are not appropriate because they restrict access to ends only (LIFO for stacks, FIFO for queues), preventing direct access to the midpoint and making the binary search strategy infeasible.
Thus, the central requirement for binary search is a sorted/ordered sequence, typically supporting efficient indexing, which is why the correct choice is an ordered list.
NEW QUESTION # 56
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