Based on
written examination 2, Monday 4 November 2013A development index is used as a measure of the standard of living in a country.
The bar chart below displays the development index for 153 countries in four categories: low, medium, high and very high.
| frequency |
a. How many of these countries have a very high development index?
b. What percentage of the 153 countries has either a low or medium development index?
Write your answer, correct to the nearest percentage.
The development index for each country is a whole number between 0 and 100.
The dot plot below displays the values of the development index for each of the 28 countries that has a high development index.
A three median line will be used to model the increasing trend in the average pay rate shown in this time series.
The independent variable to be used is year.
a. Three medians will be used to draw the three median line.
i. On the time series plot above, mark the location of each of the three medians with a cross (X).
The time series plot below shows the average pay rate, in dollars per hour, for workers in a particular country for the years 1991 to 2005.
| Average Pay Rate
(dollars per hour) |
A three median line will be used to model the increasing trend in the average pay rate shown in this time series.
The independent variable to be used is year.
a. Three medians will be used to draw the three median line.
i. On the time series plot above, mark the location of each of the three medians with a cross (X).