Context Many cell phones include default mobile applications designed to track physical activity. One example is a pedometer app, which counts the number of steps an individual takes over the course of a day while having the cell phone on their person. Suppose a student is interested in whether the default apps installed on iOS devices count the number of steps an individual completes each day with higher accuracy than more specialized fitness apps users could download for a small fee from the iOS App Store. Research Aim To explore this question further, the student asks 30 of her peers to download a specialized fitness app and, at the end of each day, record the number of steps it tracked and also record the number of steps tracked by the default iOS that came pre-installed on the phone. She hopes to use these data to assess whether there is a mean difference in the daily steps each pedometer counts. The following multiple-choice options contain math elements, so you may need to read them in your screen reader's "reading" or "browse" mode instead of "forms" or "focus" mode. Choice 1 of 6: 2-sample t-test for a difference in independent population means, 1 2 1 2 Choice 2 of 6: 1-sample z-test for a population proportion, p p Choice 3 of 6: a t-test for a population mean difference of paired observations, d d Choice 4 of 6: Simple linear regression Choice 5 of 6: 1-sample t-test for a population mean, Choice 6 of 6: ANOVA