Unit 3 General Maths Revision

Bivariate Data

100

A correlation coefficient of 0.92

What is a strong positive correlation?

200

A variable that explains the strength of an association in terms of the variation

What is the coefficient of determination?

300

The residual plot shows a pattern

What is a non-linear model?

400

The value of the correlation coefficient with an R²  value of 0.25 with a negative association

What is -0.5

500

Two non-causal explanations between variables

What is coincidence and confounding?

Time Series

100

The explanatory variable in a time series graph

What is time?

200

Two identifiable features of a time series graph

-Seasonality

-Trend

-Irregular fluctuations

300

The addition of seasonal indices split up into quarterly intervals

What is 4?

400

Removal of short-term irregularities to improve predictions

What is smoothing?

500

The average value of a seasonal index

What is 1?

Earth Geometry

100

Another name for a great circle

What is a line of longitude? 

OR 

What is the equator?

200

The time difference between Brisbane (GMT+10) and New York (GMT -5)

What is 15 hours

300

The angular distance of 1km on a great circle

What is 111.2^o?

400

The difference between GMT and UTC

What are local conditions such as daylight savings that are not considered in UTC?

500

The time difference travelling east to west across the international date line

What is one day later?

Growth and Decay

100

The type of sequence 3,6,9,12.........

What is arithmetic?

200

The type of sequence 10,5,2.5,1.25........

What is geometric?

300

The first term and common difference in t_n=3+9(n-1)

What is 3(t₁) and 9(d)

400

The common ratio in the sequence 1,5,25,125.......

What is 5?

500

The examples, exponential growth, exponential decay and compound interest

What are geometric sequences?