Uploaded April 2012 | Updated September 2026, 1 hour ago
I have an updated and revised (slower and otherwise improved) version of this video available at: youtube.com/watch?v=nk_0RcHI-vo
I work through an example, finding a confidence interval and carrying out a hypothesis test on the slope parameter.
The data used is estimated from a figure in:
Singer et al. (2004). Empathy for pain involves the affective but not sensory components of pain. Science, 303:1157--1162.
I have an updated and revised (slower and otherwise improved) version of this video available at: youtube.com/watch?v=nk_0RcHI-vo
I work through an example, finding a confidence interval and carrying out a hypothesis test on the slope parameter.
The data used is estimated from a figure in:
Singer et al. (2004). Empathy for pain involves the affective but not sensory components of pain. Science, 303:1157--1162.







![Introduction to the t Distribution (non-technical)
A brief non-technical introduction to the t distribution, how it relates to the standard normal distribution, and how it is used in inference for the mean.
For those that use R, below are the R codes to find the values found in the video.
z value for a 95% interval:
qnorm(.975)
[1] 1.959964
t value for a 95% interval (5 DF)
qt(.975,5)
[1] 2.570582
t value for a 95% interval (10 DF)
qt(.975,10)
[1] 2.228139 Introduction to the t Distribution (non-technical)](https://i.ytimg.com/vi/Uv6nGIgZMVw/mqdefault.jpg)


