Chris Graham

Two sample t-test to see if there is a difference between scores on questions between two groups when the questions are asked in a different order.

In four parts, the student builds up the definition of a class representing a rectangle. First they write the constructor, then add methods to compute area and perimeter.

In the final part, they must use the methods to write a function which determines if a rectangle's area is larger than its perimeter.

Asks the student to calculate the sum of the triangular numbers (up to some randomised number). 

Steps guide the student through each step in the calculation.

The student must write a list comprehension to map the elements of a given list.

One-way ANOVA example

Paired t-test to see if there is a difference between times taken to complete a task.

LSD and Tukey yardsticks on three treatments. Also one-way Anova test on same set of data.

6 questions which introduce the user to the Numbas system.

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Solving 2nd order differential equation for pendulum, with and without damping.

Kruskal-Wallis test with ties.

Template question. The student is asked to perform a two factor ANOVA to test the null hypotheses that the measurement does not depend on each of the factors, and that there is no interaction between the factors.

LSD and Tukey yardsticks on five treatments. Also two-way Anova test on same set of data.

This question takes in a json file containing a tv data frame in the R package ncldata (https://rdrr.io/rforge/ncldata/). 

Sort a list of numbers into "prime" or "composite".

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Questions which ask the student to intepret vector diagrams in order to write out the components in terms of base vectors. Also addition and subtraction of vectors and vector magnitude.

This question introduces base vectors i and j and asks the student to interpret a JSXGraph diagram to write four vectors in terms of the base vectors. Further parts ask the student to add vectors and find a magnitude.

This question asks the student to interpret a JSXGraph diagram to write three vectors in terms of the base vectors. Each vector has both a horizontal and vertical component. Further parts ask the student to add vectors and find a magnitude. 

Small demo using the JME implementation of JSXGraph inline in a multiple choice question. This version uses a JME variable to store the expressions and then calls a function wherever a plot is required.

Small demo using the JME implementation of JSXGraph inline in a multiple choice question.

Substitute values into formulae for the area or volume of various geometric objects.

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Numbas demo questions for NUTELA meeting, December 2017.

Download a file and scan the values into R to obtain a numeric vector of values. Then use R to explore your numeric vector in order to find the answers to these questions.

SPSS fat absorption question. Student downloads one of several SPSS files and carries out some analysis in SPSS, before returning to enter the answers. The analysis is a one-way analysis of variance. If there is a difference in the levels of the factor then a post hoc test (Tukey's honestly significant difference) is used to determine which pairs of variables are significantly different. 

Sample of size $24$ is given in a table. Find sample mean, sample standard deviation, sample median and the interquartile range.

Given random set of data (between 13 and 23 numbers all less than 100), find their stem-and-leaf plot.
This version of the question asks for 10 fields to be filled rather than the full 25, although the question statement asks for 25. I am sure that the first version asked for all 25.