Interactive practice questions
The time series shown below charts the change in interest rates over a period of years.
Loading Graph...
A trend line has been fitted to the data as shown. The equation of the trend line is closest to
$\text{rate}=-1.1\times\text{year}$rate=−1.1×year
A
$\text{rate}=-1.1+17\times\text{year}$rate=−1.1+17×year
B
$\text{rate}=15.6-1.5\times\text{year}$rate=15.6−1.5×year
C
$\text{rate}=17-1.1\times\text{year}$rate=17−1.1×year
D
$\text{rate}=17+1.1\times\text{year}$rate=17+1.1×year
E
Easy
1min
A least squares regression line is fitted to seasonally adjusted data and is given by:
$y=4.5493t+48.9941$y=4.5493t+48.9941
Easy
3min
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