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Python Institute PCED - Certified Entry-Level Data Analyst with Python Sample Questions:

1. A script defines a variable x = None and checks its truth value using a conditional statement. The developer wants to understand how Python evaluates None in Boolean contexts. What will bool(x) return?

A) True
B) None
C) Error
D) False

2. A loop includes a break statement when a condition is met. The programmer wants to understand how break affects loop execution. What happens when break is executed inside the loop?

A) Loop ends immediately
B) Skips one iteration
C) Loop restarts
D) Error

3. A list is reversed using slicing: lst[::-1]. The programmer wants to confirm whether this modifies the original list or creates a new one. What is the correct behavior?

A) Modifies original
B) Creates new list
C) Returns None
D) Error

4. You are given the following list of daily step counts:
steps = [8230, 9020, 7640, 8760, 10020, 2546, 9817]
Your task is to calculate:
- the standard deviation of the step counts,
- the average rounded up to the nearest whole number, and
- the median of the step counts.
Which code snippet correctly performs all three tasks? Select the best answer.
import statistics

A) import math
print(statistics.stdev(steps))
print(math.ceil(statistics.mean(steps)))
print(statistics.median(steps))
B) import math
print(math.stdev(steps))
print(statistics.mean(steps))
print(statistics.median(steps))
import statistics
C) import math
print(statistics.variance(steps))
print(math.ceil(sum(steps) / len(steps)))
print(math.floor(statistics.median(steps)))
import statistics
D) import math
print(statistics.stdev(steps))
print(round(math.mean(steps)))
print(math.median(steps))
import statistics

5. Consider the following Python code:

What will be printed when the code above is executed?
40

A) [10, 20, 30, 40]
1
[1, 2, 4, 5, 6]
50
B) [10, 20, 30, 40]
0
[1, 2, 3, 4, 5, 6]
50
C) [20, 30, 40]
1
[1, 2, 4, 5, 6]
D) [20, 30, 40]
1
[1, 2, 4, 5, 6]
50