Interactive practice questions
A science student is testing solar panels and constructs a scatter plot to compare the solar radiation intensity to electricity output. The scatter plot shows the electrical output as the explanatory variable and the solar radiation as the response variable.
Choose the best description of the relationship between the solar radiation and electrical output.
Strong non-linear correlation.
Perfect positive linear correlation.
Strong positive linear correlation.
Perfect negative linear correlation.
The table shows a company's revenue $y$y (in millions) in week $x$x. The equation $y=2x+14$y=2x+14 is being used to model the data.
The table shows a company's costs $y$y (in millions) in week $x$x. The equation $y=5x+12$y=5x+12 is being used to model the data.
Soil salinity is a problem that affects large areas of farmland in Australia. A farmer has measured wheat production $W$W (in tonnes per hectare) for a number of paddocks with various salt levels $S$S (in kg per hectare).