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

1. A Python script evaluates the expression len(" "). The programmer assumes it might be zero because it looks empty. What will the actual result be?

A) Error
B) None
C) 1
D) 0

2. 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)

3. A data analyst exports a cleaned dataset from Python and wants to share it with a colleague for easy use in Excel.
Which file format is best suited for this purpose? Select the best answer.

A) CSV, because it stores tabular data in plain text and is compatible with spreadsheet applications.
B) XML, because it automatically preserves spreadsheet formatting and charts.
C) JSON, because it stores hierarchical data and is designed for visual presentation in Excel.
D) SQL, because it directly converts tabular data into database tables that Excel can open.

4. What will be the output of the following code?

A) 5 10
B) 10 10
C) 5 5
D) 10 5

5. Below are six possible summaries for your presentation:
- Summary 1: "The data revealed a moderate positive correlation between age and recycling frequency. While 72% of students reported recycling paper regularly, only 39% reported recycling plastic."
- Summary 2: "Analysis showed notable differences in recycling habits by material type, with paper being most recycled and plastic least recycled."
- Summary 3: "Older kids recycled more than younger ones. Paper was the most recycled item- plastic got forgotten a lot."
- Summary 4: "Student responses showed positive environmental habits overall, though participation varied by waste type."
- Summary 5: "A lot of students said they recycle. Some didn't answer every question, so we couldn't figure out everything."
- Summary 6: "We asked more than 300 students about recycling. Most said they recycle paper, but way fewer recycle plastic." Which communication style is the best fit for Group A (data scientists) and Group B (12-year- olds), respectively? Select the best answer.

A) Summary 2 for Group A. Summary 6 for Group B
B) Summary 4 for Group A, Summary 3 for Group B
C) Summary 6 for Group A, Summary 3 for Group B
D) Summary 1 for Group A, Summary 3 for Group B
E) Summary 6 for Group A, Summary 5 for Group B
F) Summary 1 for Group A, Summary 6 for Group B

Solutions: