7 Each of a random sample of 6 cyclists from a cycling club is timed over two different 10 km courses. Their times, in minutes, are recorded in the following table.
Cyclist
\(A\)
\(B\)
\(C\)
\(D\)
\(E\)
\(F\)
Course 1
18.5
17.8
19.2
22.3
16.5
20.0
Course 2
20.2
20.4
18.1
20.6
18.5
20.5
Assuming that differences in time over the two courses are normally distributed, test at the \(10 \%\) significance level whether the mean times over the two courses are different.