Lab 05: One-Sample t-tests

PSY 203: Lab 5.

The primary website for this course is https://faculty.bard.edu/~jdainerbest/psy-203

These are all of the instructions for Lab 5. The list of labs is here.

This website contains R lab code for labs in Bard College’s Fall 2020 for Statistics for Psychology, taught by Prof. Justin Dainer-Best.

You will download the lab’s files to your computer or to your rstudio.cloud account.

Objectives

The following lab builds on your skills with ggplot2, using filter(), and helps you practice using z-scores and t-scores to test simple sample means. This lab anticipates that you have read Chapter 7 of the course textbook, listened to the initial lecture on t-tests, or have a background on t-tests; however, most of the lab reviews material you have already covered in previous labs.

Make sure you’re in the right working directory

Set your working directory if necessary. Check that you’re in the directory you expect by running getwd() in the Console. If you need more help, look at the wiki page on setting a working directory.

Today’s lab

There is no tutorial today; you’ll be focusing on an R Markdown file.

To download it, run the following single command. Please note: only run the usethis::usezip() line once! Running it again will result in your overwriting the files on your computer—potentially losing your work.

Additionally, although this now spans three lines, make sure you run the whole command, all the way to the closing parenthesis.

usethis::use_zip(paste0("https://github.com/jdbest/",
                        "psy-203/raw/master/lab05.zip"), 
                        cleanup = TRUE)

This exercise explores the commands you learned and lets you continue practicing the steps of hypothesis testing.

Double click on the file called one-sample-t.Rmd to open it, and follow the instructions. (Alternatively, find it in your Files pane inside the lab05 folder.)