Question

Hypothesis Testing (Two samples – proportions)

8. The Billy Boot garbage bag company randomly selects 350 bags during the first hour of production and finds 19 of them have holes. After modifying the raw plastic used in the process, another check of 420 bags shows that 9 have holes. At the 0.10 level of significance, test the claim that the modification has decreased the proportion of bags with holes.

Answer 1