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

1. A health researcher uses wearable devices to record physical activity and sends a survey to randomly selected participants across age groups.
Why can this approach be effective? Select the best answer.

A) It limits sampling to one demographic, ensuring high-quality data within a specific group.
B) It uses unstructured interviews to validate automated tracking, improving bias detection.
C) It combines automated data collection with representative sampling, reducing the risk of bias.
D) It relies on observational methods, which are more accurate than surveys or sensors.

2. You are developing a temperature control module for a laboratory incubator. Your objectives are to:
- generate timestamps every 10 minutes over a 3-hour span (i.e., 0 to 180 minutes), and
- simulate five evenly spaced target temperatures between 35.0°C and 37.0°C for system calibration.
Which code snippet correctly produces both sequences using NumPy? Select the best answer.
import numpy as np

A) timestamps = np.linspace(0, 180, 10)
target_temps = np.arange(35.0, 37.0, 5)
import numpy as np
B) timestamps = np.linspace(0, 181, 10)
target_temps = np.arange(35.0, 37.0, 0.5)
import numpy a3 np
C) timestamps = np.arange(0, 181, 10)
target_temps = np.linspace(35.0, 37.0, 5)
D) timestamps = np.arange(0, 180, 10)
target_temps = np.linspace(35.0, 37.0, 4)
import numpy as np

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

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

4. A script attempts to divide two numbers using / and //. The values are 7 and 2. The developer wants to understand the difference between true division and floor division. What are the results respectively?

A) 4 and 3
B) 3 and 4
C) 3.5 and 3
D) 3 and 3.5

5. You are reading a data.csvfile line by line. To prepare each line for formatting with f-strings, you need to remove extra whitespace and split the values by commas.
Which line should you insert to correctly clean and parse the input?

A) fields = line.strip().split(', ')
B) fields = line.split().strip(', ')
C) fields = line.replace(', ', '|').split('|')
D) fields = line.split(', ').trim()

Solutions: