Correlation Tests

$\displaystyle H_0$: there is no correlation between hours of practice and success rate.
$\displaystyle H_1$: there is a correlation between hours of practice and success rate.

$\displaystyle 0.415 > 0.05$, so there is insufficient evidence to reject the null hypothesis.
There is no significant correlation between the two variables. The confidence interval containing zero agrees with this.

$\displaystyle 0.0004 < 0.05$, so reject the null hypothesis.
There is a significant positive correlation between hours of practice and success rate.

The test looks for a correlation, not for an effect, and it cannot show that one thing causes another.
The correct conclusion is that there is insufficient evidence of a correlation between shoe size and typing speed.

$\displaystyle 25$ hours is far outside the range of the data, so the prediction would be an extrapolation.
There is no evidence that the relationship continues at that level of practice.