Christopher Graham

Christopher Graham on Biomedical Sciences Diagnostic Test 3 weeks, 3 days ago

Gave some feedback: Ready to use

Christopher Graham on Biomedical Sciences Diagnostic Test 3 weeks, 3 days ago

Gave some feedback: Needs to be tested

Christopher Graham on Extract common factors of polynomials 1 month, 3 weeks ago

The pattern match on line 10 of the custom function no longer appears to handle the commutativity of the expression, despite using the doCommute option. E.g. $2*(17x+2)$ is not acccepted, however $(17x+2)*2$ is.

Christopher Graham on Extract common factors of polynomials 1 month, 3 weeks ago

Saved a checkpoint:

Checkpointing before looking at the problem with the user defined function mark_factorised which no longer appears to be functioning correctly.

Christopher Graham on Extract common factors of polynomials 1 month, 3 weeks ago

Gave some feedback: Has some problems

Christopher Graham on Complete the square and find solutions 1 month, 3 weeks ago

Changed gaps to number entry, as they were not being marked correctly as mathematical expressions.

Christopher Graham on Perform a paired t-test 3 months, 2 weeks 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? 

Christopher Graham on Perform a paired t-test 3 months, 2 weeks ago

Gave some feedback: Has some problems

Christopher Graham on One sample t-test 3 months, 3 weeks 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.