Lesson details

Key learning points

  1. In this lesson, we will learn about the investigative cycle PPDAC (problem, plan, data, analyse, conclusion) and apply part of this cycle to a data set about roller coasters.


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3 Questions

In relation to data science, advances in technology has made it more feasible to do what?
Correct answer: Collect, store and analyse large volumes of data
Data to be analysed at a local level, it is still not possible to analyse data sets that collect global data
Store large volumes of data but data collection still needs to be done manually
What data might a video streaming service collect?
Correct answer: All of the above
Most popular actors
Most popular genres
Most popular tv shows
Users' favourite actors/directors based on their viewing habits
Users' favourite genre based on their viewing habits
Which two of the following might be reasons why a video streaming service collect this data?
Correct answer: To make decisions about what movies or TV shows they might commission
Correct answer: To make personalised recommendations to their customers about what movies or TV shows they might enjoy
To store and pass on to other companies without your permission

3 Questions

What is meant by a correlation?
Correct answer: The relationship between two or more variables
When data is placed in a graph
When there is a set of data that doesn’t lie in the normal or expected range
When there is an upward trend in a graph
The visualisation below plots life expectancy (y-axis) against time (x-axis). What type of correlation does this visualisation show from 1949 onwards?
An image in a quiz
No correlation is visible
Correct answer: Positive
The following graph shows the annual average temperatures recorded by a weather station over a period of 20 years. Identify the outlier in the data.
An image in a quiz
Point A
Point B
Correct answer: Point C
Point D