Year 12 Unit 3 General Maths Recap

Front

During a hybridisation experiment a scientist counted the tall and dwarf marigold plants. This is an example of:

Back

discrete data

Front

Best method to display relationship between iron and vitamin C in blood samples?

Back

Scatterplot

Front

The following two-way frequency table shows the composition of left- and right-handed students in Years 11 and 12 at a school. The percentage of all left-handers who are in Year 11 is closest to:

Back

40%

Front

A researcher administers different amounts of fertiliser to a number of trial plots of potato crop. She then measures the total mass of potatoes harvested from each plot. When drawing the scatterplot, the researcher should graph:

Back

mass of harvest on the y-axis because it is the response variable, and amount of fertiliser on the x-axis because it is the explanatory variable

Front

What type of correlation does an r-value of 0.64 indicate?

Back

Moderate, positive correlation

Front

A gardener tracks a correlation coefficient of 0.79 between the growth rate of his trees and the amount of fertiliser used. What can the gardener conclude from this result?

Back

The growth rate of the trees is influenced by the amount of fertiliser used

Front

y = 0.54 + 15.87x; Find y when x = 2.5.

Back

40.215

Front

A series of data points recorded a coefficient of determination value of 0.82. Calculate Pearson’s correlation coefficient.

Back

0.91

Front

The deseasonalising process on time series data is used to:

Back

remove any seasonal trends

Front

The above table shows the seasonal indices from a time series. The value of the seasonal index for quarter 3 is:

Back

1.19