This user hasn't written a bio yet.

Browse Christopher's content


Christopher's activity

Picture of Christopher Graham

Christopher Graham on Perform a paired sample t-test 1 week, 4 days ago

Though you could use $\dots$, the important thing is that it demonstrates the method and I don't think you need all of the terms to do that. Also needs \simplify{} in that expression to avoid double minus signs.

You could consider reducing the sample size, which would also make part (a) less laborious for the student.

You can use dpformat(n,d) to format a number n to d decimal places in the advice. 

I think we need to think a little more about the context: what is the test / what are the units? What is the handedness of the individuals? (You could also refer to dominant/nondominant to avoid right/left) And do we need to bias the results to reflect that? 

Picture of Christopher Graham

Christopher Graham on Perform a paired sample t-test 1 week, 4 days ago

Gave some feedback: Has some problems

Picture of Christopher Graham

Christopher Graham on One sample t-test -SES 2 weeks, 5 days ago

Thanks Lauren, can you check with Phil regarding the wording of the last part. I think (I'm no statistician) that you are not supposed to "accept" a null hypothesis, rather you "do not reject" it. 

Picture of Christopher Graham

Christopher Graham on One sample t-test -SES 3 weeks, 1 day ago

Hi Lauren, can you move this into the sports science project please.

You've left it a bit in the air whether you are testing the student on which type of test to use. A t-test is implied in part (d), so I would either remove that to just say "test statistic" and start the question with a multiple choice asking which type of test is appropriate, or perhaps just state explicitly that the method will be to use a t-test in the statement.

I would split (d) into two parts, one to identify the significance level (also multiple choice) and the second to draw a conclusion from it.

You should split the advice by parts to help the student to easily digest the information.

Picture of Christopher Graham

Christopher Graham on One sample t-test -SES 3 weeks, 1 day ago

Gave some feedback: Has some problems

Picture of Christopher Graham

Christopher Graham on Find the equation of a line through two points - positive gradient 4 weeks, 1 day ago

Fixed bug in correct line plot, caused by reading wrong student answer box (must have had a part added)

Picture of Christopher Graham

Christopher Graham on Add two numbers 4 weeks, 1 day ago

Great question!

Picture of Christopher Graham

Christopher Graham on Add two numbers 4 weeks, 1 day ago

Gave some feedback: Ready to use