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

1. You are creating a presentation slide to communicate findings about student stress levels across four categories over a six-month period. You include the following line graph in your presentation:

Your goal is to help your audience clearly understand trends in stress levels over time.
What is the highest problem with this visual presentation? Select the best answer.

A) The chart should be in 3D format to show depth and highlight differences more clearly.
B) The graph doesn't explain what each stress level means or show exact values for each month, which limits interpretation.
C) The months should be replaced with week numbers to provide more detailed insight.
D) The lines are too light and similar in color, making it difficult to distinguish between trends.
E) The font used in the chart is hard to read; using larger, uppercase text would improve clarity.

2. You are analyzing survey results from students about their favorite colors. The list colorsstores individual responses:

You want to:
- find the number of unique colors mentioned using NumPy, and
- determine how often each color was chosen using Counter.
Which code snippet correctly performs both tasks? Select the best answer.
from numpy import unique

A) from collections import Counter
unique_colors = Counter(colors)
color_counts = sum(np.unique(colors))
import numpy as np
B) from collections import Counter
unique_colors = len(unique(colors))
color_counts = Counter(colors)
import numpy as np
C) from collections import Counter
unique_colors = len(set(colors))
color_counts = np.unique(colors)
D) from collections import Counter
unique_colors = np.unique(colors)
color_counts = Counter(set(colors))
import numpy as np

3. Given the following string:
text = "Report2024Final"
Which of the following statements are entirely correct? (Choose two.)

A) text[-6].isdigit() returns True, text.startswith("r") returns True
B) text[0:6].isalpha() returns True, and text.find("2024") returns 6
C) text.capitalize()changes Finalto lowercase, and text.find ("L")returns True
D) text.isalpha()returns True, and text.find ("2024")returns True
E) text.capitalize()changes Report2024Finalto REPORT2024FINAL, and text.find("2024")returns 6
F) text[6:8].isdigit()returns True, and text.endswith("Final")returns True

4. A program uses slicing on a string "Python". The expression s[1:4] is evaluated. Which substring will be returned?

A) tho
B) ythn
C) yth
D) ytho

5. You are given two lists representing daily page views and sign-ups on a website:
views = [120, 130, 128, 700, 115, 123, 119, 680, 122]
signups = [12, 15, 13, 50, 11, 14, 10, 55, 13]
You want to:
- remove outliers (views > 600), and
- calculate correlation between the cleaned lists.
Which code accomplishes this correctly? Select the best answer.

A)

B)

C)

D)

Solutions: