A car manufacturer has recently updated its assembly process

Last updated: 8/1/2023

A car manufacturer has recently updated its assembly process with the aim of reducing the proportion of defective vehicles Before the process change the proportion of defective vehicles was 0 12 After the change a sample of 500 vehicles was tested and 48 were found to be defective The manufacturer wants to know if there is significant evidence at a 0 05 level that the proportion of defective vehicles has decreased What are the null and alternative hypotheses and which statistical test should be used H0 p 0 096 Ha p 0 096 O HO p 0 12 Ha p 0 12 None of the above This is a two sample test O HO p 0 096 Ha p 0 096 O HO p 0 12 Ha p 0 12