Lesson
Exercise 1
Think about, then discuss the strength and correlation of the following pairs of variables in the list below...
- The floor space of an office and the number of desks that can fit
- The number of students on an excursion and the number of teachers supervising
- The number of text messages sent and the amount of prepaid credit remaining
- The distance driven by a car and the amount of fuel in the tank
- The height of a person and the number of hats they own
- A household electricity bill and the total income of the residents
- The amount of internet data and the age of the internet user
Exercise 2
The average price of an airline ticket on a particular route between the years 2001 and 2009 is listed in the table below:
Average airline ticket prices (2001 to 2009)
- Present this data in a scatterplot using a spreadsheet tool
- Fit a 'trendline' to the data and display the equation of the line.
- Is this trendline accurate? Give reasons for your answer and comment on the factors that might be affecting the data.
- The below table highlights the prices between 2010 and 2014:
Average airline ticket prices (2010 to 2014)
- Plot the data on a separate graph and display the equation of the line.
- Compare the accuracy of this trendline to the one above.
- Using the equation of the line, predict the price of the airline ticket in the year 2015.