Correction for part A: the method that I show in the guide is correct and will work, but it deviates a bit from what they expect you to do. If you use my method, you’ll have to plot your data manually in Excel because your data will be negative and won’t display in the applet window. If you’d prefer, you can simply plot ln(P) vs h - h0 and take the slope of the resulting line as they instruct you to do, and this will also work. This method is a bit handwavy. Why this works is a bit hard to explain, given the fact that our slope now would have units of logged kPa / m instead of inverse m, but it does work nevertheless.

Another tip for part A: make sure to zoom in on your data by adjusting the “y-max” and “y-min” values to be just barely above and below your biggest and smallest y values. You should be zoomed in far enough that you can see the negative slope of your line (it shouldn’t look like a horizontal line).