Here is the data about wheat yield from 8 identical wheat fields in conventional units:
\[ 2 6 . 5 \quad 2 6 . 2 \quad 3 5 . 9 \quad 3 0 . 1 \quad 3 2 . 3 \quad 2 9 . 3 \quad 2 6 . 1 \quad 2 5 . 0 \]
There is a suspicion that the data about the third field is incorrect. Check if it should be dropped with 5% significance level.