Please help

A doctor claims that patients using mainstream medicine for a particular ailment recover faster than those using alternative medicine. A researcher tests the claim by comparing a sample of patients who used mainstream medicine to a sample of patients using alternative medicine. They do not have any population data. The researcher will need to conduct a: O Paired Two-Sample z-test O Independent Two-Sample z-test O Paired Two-Sample t-test O One sample t-test O Independent Two-Sample t-test