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From users who are members of R programming :

Aamir Khan

said

Ready to use

2 years, 7 months ago

History

○

Christian Lawson-Perfect 1 year, 10 months ago

Published this.

○

Aamir Khan 2 years, 7 months ago

Gave some feedback: Ready to use

○

Aamir Khan commented 2 years, 7 months ago

Expected answers now show the literal numbers.

Variables are not being passed anymore so things like rnorm(n,mu,sigma) won't be marked as correct.

○

Christian Lawson-Perfect 2 years, 7 months ago

Saved a checkpoint:

Since you define the variables n, mu and sigma in R, the student can write rnorm(n,mu,sigma) and it's marked correct.

I think you should either not pass them through as variables, but sub into the preamble, or pass them through under hard-to-guess names.

The expected answer should certainly use the literal numbers, rather than the names.

Restore this checkpoint

○

Aamir Khan 2 years, 7 months ago

Gave some feedback: Needs to be tested

○

Aamir Khan 2 years, 7 months ago

Created this.

There is only one version of this question that you have access to.

There are 2 other versions that do you not have access to.

Question statement

Give any introductory information the student needs.

			Name	Type	Generated Value

mu	integer	2
sigma	number	0.5
n	integer	13
x	integer	3
p	number	0.4
lambda	integer	6
y	integer	10
alpha	number	3.6

			Name	Type	Generated Value

Automatically regenerate variables?

Name

Data type

Value

A random number between and (inclusive) with step size

Description

$\mu$ used in part a.

Describe what this variable represents, and list any assumptions made about its value.

Can an exam override the value of this variable?

Generated value: `integer`

Parts

Part a) Code
Part b) Code
1. Alt Unnamed alternative
Part c) Code
1. Alt Unnamed alternative
Part d) Code

Code

Ask the student a question, and give any hints about how they should answer this part.

Give the command to generate $\var{n}$ random samples from a Normal distribution with $\mu=\var{mu}$ and $\sigma=\var{sigma}$.

Help with this part type

Marks

Show correct answer on reveal?

Show score feedback icon?

Show the input hint?

Code language

The language that the student's code will be written in.

Correct answer

xxxxxxxxxx
 
rnorm({n},{mu},{sigma})

A correct answer to the part.

Substitute question variables into the correct answer?

If ticked, then JME expressions between curly braces will be evaluated and substituted into the correct answer.

If not ticked, then the correct answer will be displayed exactly as it is.

Show stdout?

If ticked, the STDOUT produced after running the student's code will be shown in the feedback.

Show stderr?

If ticked, the STDERR produced after running the student's code will be shown in the feedback.

Show errors produced by marking tests?

Placeholder

​x
 
​

Initial text for the code editor

Student code modifier

​

JME expression to modify the student's submitted code before being passed to the marking template. The student's code is available as the string variable studentAnswer.

Preamble

xxxxxxxxxx
 
set.seed(2906)

This code is run before the student's code. Define anything that the student's code or your tests need.

Postamble

xxxxxxxxxx
 
student_answer=.Last.value
set.seed(2906)

This code is run after the student's code but before the validation and unit tests.

Format postamble output as code?

If ticked, any output produced by the postamble will be formatted in monospace font, with whitespace preserved. If not ticked, it'll be presented as prose text or HTML.

Marking tests

xxxxxxxxxx
 
[
  ["Correct calculation", 1, "identical(student_answer,rnorm({n},{mu},{sigma}))"]
]

A list of tests used to mark the student's answer.
Each item is a list with three values:

The name of the test, shown to the student above any feedback.
The proportion of the credit available for the part to award if this test is passed.
The code to run.

Validation tests

xxxxxxxxxx
 
[
]

A list of tests used to validate that the student's code is acceptable.
Each item is a list with two string values:

A name which will be shown to the student if the test fails.
The code to run.

Variables to include in code

xxxxxxxxxx
 
dict()

Give a dictionary mapping variable names to their values. These variables will be available in the code that is run.

Advice

Give a worked solution to the whole question.

Use this tab to check that this question works as expected.

There was an error which means the tests can't run:

Part	Test	Passed?
Code
Code		Hasn't run yet
Code
Code		Hasn't run yet
Code
Code		Hasn't run yet
Code
Code		Hasn't run yet
Code
Code		Hasn't run yet
Code
Code		Hasn't run yet

This question is used in the following exams:

R Refresher Test by Aamir Khan in NCL MAS2906.
R Refresher Test by Chris Graham in Chris's workspace.

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Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

Christian Lawson-Perfect 1 year, 10 months ago

Aamir Khan 2 years, 7 months ago

Aamir Khan commented 2 years, 7 months ago

Christian Lawson-Perfect 2 years, 7 months ago

Aamir Khan 2 years, 7 months ago

Aamir Khan 2 years, 7 months ago

Error in variable testing condition

Error

Warning

Generated value: `integer`

Parts

Code

Loading...

Error

Distributions

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

Christian Lawson-Perfect 1 year, 10 months ago

Aamir Khan 2 years, 7 months ago

Aamir Khan commented 2 years, 7 months ago

Christian Lawson-Perfect 2 years, 7 months ago

Aamir Khan 2 years, 7 months ago

Aamir Khan 2 years, 7 months ago

Error in variable testing condition

Error

Warning

Generated value: integer

Parts

Code

Generated value: `integer`