## Doing Independent-Samples T-tests Quiz

**Doing Independent-Samples T-tests**

- Download the file timeonsite.csv from the course materials. This file describes a website A/B test in which visitors’ time-on-site was measured in two website variations. How many subjects were in this website A/B test?
- How many subjects were exposed to each variation of the website A and B?
- To the nearest tenth (one digit), what was the median time on sire for site “B”?
- To the nearest hundredth (two digits), what was the standard deviation of time on site for site “A”?
- Conduct an independent-samples t-test on Time by Site. Assume equal variances. To the nearest hundredth (two digits), What is the t-statistic?
- How many degrees of freedom resulted from the t-test?
- To the nearest ten-thousandth (four digits), what was the p-value for this test?
- What is the most proper way to report this t-test result?
- The results show that, on average, website “A” resulted in almost 13 seconds greater time-on-sire than website “B”, and that this difference was statistically significant. (Note: Assume Time is measured in seconds).
- By Setting the var. equal parameter to FALSE, a Welch t-test can be run, which does not assume equal variances.