# Christopher Graham

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## Christopher's activity

#### 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 copied Solve a quadratic with the formula to Christopher's copy of Solve a quadratic with the formula 2 months, 1 week ago

#### 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.