Tehdas valmistaa kysi, jotka kestvt keskimrin 300 kg:n taakan keskihajonnan ollessa 24 kg. Valmistusprosessia on uudistettu, ja mitattaessa 64 kyden vetolujuudet havaitaan niiden keskimrisen kestvyyden olevan 310 kg. Testaa merkitsevyystasolla 0.01, onko uudistus lisnnyt kysien kestvyytt.

(English) The factory produces ropes that can withstand an average load of 300 kg with a standard deviation of 24 kg. The manufacturing process has been renewed, and when measuring the tensile strength of 64 ropes, it is found that their average resistance is 310 kg. Test at a significance level of 0.01 whether the reform has increased the durability of the ropes.