Bivariate Data Analysis
What does a scatter-plot display?
The relationship between two variables.
What is a time series?
Data collected over time.
What is an arithmetic sequence?
A sequence with a constant difference.
What does latitude measure?
Distance north or south of the equator.
Are places further east generally ahead or behind in time?
Ahead.
What are the features used to describe a scatterplot?
Strength and direction.
What do we call a long-term upward or downward movement in data?
A trend.
What is a geometric sequence?
A sequence with a constant ratio.
What does longitude measure?
Distance east or west of the Prime Meridian.
How many degrees of longitude represent one hour?
15o.
What does a correlation coefficient close to -1 indicate?
A strong negative linear relationship.
What does a seasonal index of 1 represent?
The value is at the average level.
Is 3, 6, 12, 24 an arithmetic or geometric sequence?
Geometric.
What is the latitude of the equator?
0o.
If it is 2 pm in Brisbane, is the time earlier or later in Perth?
Earlier.
If r=0.8, calculate r2 as a percantage.
64%
Calculate the 3-month moving average of 12, 15 and 18.
15.
Find the 10th term of the sequence 5, 8, 11, 14…
32.
What is the angular difference between 35°N and 25°S?
60o.
Two locations have a longitude difference of 60°. What is their time difference?
4 hours.
A regression line is y=4x+10, predict y when x=15.
y=70.
An actual sales figure is $240,000 and its seasonal index is 1.2. Calculate the deseasonalised value.
$200,000.
A car worth $40,000 loses 15% of its value each year. Calculate its value after 2 years.
$28,900.
Calculate the distance along a parallel at 60°S between two locations with a longitude difference of 40°. Use Earth's radius = 6371 km.
Approximately 1,111 km.
It is 8 pm Monday at 150°E. What is the time and day at 90°W?
5 am Tuesday.