Christian Lawson-Perfect
Member of the e-learning unit in Newcastle University's School of Mathematics and Statistics.
Lead developer of Numbas.
I'm happy to answer any questions - email me.
Christian's activity
Christian Lawson-Perfect on Compound units : shopping for bananas 8 years, 5 months ago
Gave some feedback: Ready to use
Christian Lawson-Perfect on Compound units : shopping for bananas 8 years, 5 months ago
Saved a checkpoint:
Fixed a static pronoun. Otherwise, good.
Christian Lawson-Perfect on Converting units of volume (cc/cm^3/litres/m^3) 8 years, 5 months ago
Gave some feedback: Ready to use
Christian Lawson-Perfect on Converting units of volume (cc/cm^3/litres/m^3) 8 years, 5 months ago
Saved a checkpoint:
Fixed a typo. Otherwise good!
Christian Lawson-Perfect on Converting units: baby weight 8 years, 5 months ago
Gave some feedback: Ready to use
Christian Lawson-Perfect on Converting units: baby weight 8 years, 5 months ago
Saved a checkpoint:
Couldn't resist changing the weight to be picked from a normal distribution. I got massive weights a bit too often.
Otherwise, this is really good!
Christian Lawson-Perfect on Probability of the union of two non-mutually exclusive events 8 years, 5 months ago
Gave some feedback: Ready to use
Christian Lawson-Perfect on Probability of the union of two non-mutually exclusive events 8 years, 5 months ago
Saved a checkpoint:
After being "fixed", the statement was incorrect: the first two items were for only eating cereal or toast, so the probability of eating either is the sum of all three items. This isn't what was intended.
After lots of back and forth, I think we've settled on a wording that works. I've changed the statement to give a table with five options, adding up to over 100%, to make it clear that the percentages include people who selected more than one option.
Christian Lawson-Perfect on Mutually exclusive events MCQ 8 years, 5 months ago
Gave some feedback: Ready to use
Christian Lawson-Perfect on Mutually exclusive events MCQ 8 years, 5 months ago
Saved a checkpoint:
I've reworded the options so it's more clear what the two events are.
This isn't a great question - I'd prefer more examples and clearer pairs of events, but it'll do.