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Written by IB Experts
Question 1
A health study uses volunteer participants wearing fitness trackers to record daily steps. Characterize the data, critique the sampling method, and one statistical correction for self‐selection bias.
[4]Question 2
A market researcher samples weekly grocery expenditure by interviewing customers at one high‐end supermarket. the sampling method, its limitations, and a sampling strategy to reflect citywide spending habits.
[5]Question 3
A meteorological station records temperature every hour but one sensor is known to read too low. Classify the error type, its impact on data, and recommend how to adjust recorded values.
[4]Question 4
A city planner measures average commute times by surveying people waiting at a downtown bus stop at . the data characteristics, the sampling technique, and propose two ways to reduce bias.
[5]Question 5
A university collects final exam scores (out of 100) from a single tutorial group to represent the entire course.
the type of data collected. the representativeness of the data, potential sampling flaws, and recommend an improved sampling .
[5]Question 6
A transport department surveys the 'mode of travel' by handing out questionnaires at a train station entrance.
(a) the data type of the variable 'mode of travel'.
(b) one possible source of sampling bias in this survey.
(c) one alternative sampling method to reduce this bias.
[4]Question 7
In a rural clinic, blood pressure readings are taken from patients who walk in without appointment. the sampling frame, flaws, and how to true population blood pressure distribution.
[5]Question 8
Parents report their children’s daily mobile phone usage hours in a school survey. the data type, potential reporting errors, and propose how to validate responses.
[3]Question 9
An online retailer analyzes customer satisfaction ratings ( to stars) from reviews posted on its website.
the data type, sampling approach, pitfalls, and propose one way to obtain more representative feedback.
[5]Question 10
A survey of patients in a clinic records pain on a scale of 0–10 but gives no verbal anchors. the scale type, potential measurement issues, and how to improve reliability.
[5]Question 11
A study records hours of sleep per night for college students only during weekdays.
Characterize the data, any biases, and recommend one way to capture full sleep patterns.
[4]