# 1 Data, statistical information and statistics

1.4 Exercises

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- Identify which items in the list are structured data and which items are unstructured data.
- A bank statement
- An email
- A grocery store flyer
- A school report
- Results from a web search engine

- Find which concept is associated with each definition.
- Some observation units don’t have a value for one variable in a data set.
- Data that have been classified and interpreted.
- The most representative value of the units in data sets.
- A software that allows users to make mathematical operation on numeric data.
- The lag between the period of reference and the availability of the information.
- A data set in which a record represents only one observation unit.
- A visualization that combines images with statistical information to tell the story of the data.

- Identify which of the six quality dimensions is problematic in each of the situations listed below.
- You found the perfect data set for a school work, but there is a cost to be able to get the data.
- You want to calculate the average age of people in your school, but you only have the age of the students.
- You want to explore a data set, but you don’t know what each variable means because the names of the variables are not explicit.
- You made a survey in your class to know the level of physical activity of your classmates, but some replied with a number of steps and some with a distance in kilometres. For this reason, it is hard to identify those who do the most physical activity in a week.

- True or false?
- Statistics are raw materials from which the statistical information is created.
- In 2025, there will be fewer 15-year-old people than 45-year-old people in Canada.
- In the second quarter of 2019, retail sales had increased in all commodity groupings compared to the previous year.
- The goal of statistics is to provide useful information using numbers.

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