申論題

2. (總分 25 分) An experiment was conducted to examine the effect of a device on users' perception reaction times to road hazard ahead. Eight people were included in this study. The reaction times (in seconds) for the experiment are as follows:

(c). (11 分) Compare the results in (a) and (b), and discuss which experimental design is usually preferred? Which result is more theoretically sound? And what are the sources that affecting the widths of the confidence intervals? Explain.