Question: an engineering firm designed a new packaging system to reduce defective packages. Before the new system was installed, the mean rate of defective packages is

an engineering firm designed a new packaging system to reduce defective packages. Before the new system was installed, the mean rate of defective packages is 17%. After the installation, it was observed that the mean rate of defective packages dropped to 15%.

What statistical question should we ask to determine whether the new system is actually the cause of defect reduction?

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