Loading...
Error
There was an error loading the page.
Taxonomy:
Contributors
History and Feedback
Christian LawsonPerfect 2 years, 6 months ago
Gave some feedback: Ready to use
Christian LawsonPerfect 2 years, 6 months ago
Saved a checkpoint:
This is a good question.
I've changed the titles of the films to randomlygenerated ones because (a) they were a bit stereotypically boyheavy and (b) they'll really date this question. There's also (c) are we allowed to use trademarks?
Elliott Fletcher 2 years, 6 months ago
Published this.Elliott Fletcher 2 years, 6 months ago
I have inverted the table and moved it into the statement and i have also added an extra part about Genre.
Elliott Fletcher 2 years, 6 months ago
Gave some feedback: Needs to be tested
Chris Graham 2 years, 6 months ago
Gave some feedback: Has some problems
Chris Graham 2 years, 6 months ago
Can we invert the table so that "Film" and "P(Film)" are columns? Also, the table and everything above it should be the question's statement, with the part beginning "100 people..."
It's a nice straightforward question, but you could add a little bit to this with an extra column "Genre", ie. action, comedy, sci fi etc. And then ask the student to calculate the expected number going to see a particular genre (of which there is say 2 films). Just make sure that you still have 'nice' numbers if you do this, so that the expected value comes to a whole number.
Lauren Richards 2 years, 6 months ago
 I think the question statement should just be right at the start of the advice.
 I actually think the two parts should be completely separate questions. There are definitely enough individual questions in part b) to make it a good lengthy question with i), ii) and iii) as individual parts that can be marked separately. You can relatively easily add in another question part for part a) to lengthen it if you wanted to. Maybe something about age ratings or something.
 b)ii) I would programme in a fraction with gap fills so they can answer it like that rather than getting them to do a fraction with no fraction sign and no instruction to do it like a/b.
 I think this is a great question, and I can't find very much wrong with it at all, well done Elliott!
Elliott Fletcher 2 years, 6 months ago
Gave some feedback: Needs to be tested
Hannah Aldous 2 years, 6 months ago
just a few things to comment on
 in the statement equation it says 'expected of times' which doesn't make sense
 maybe you could explain what p(film) is somewhere
 the way you have phrased '120 people buy tickets to see one of...' makes it sound like they all bought the same film ticket
 i think you can omit 'by rolling a 2 or 4' in b i as you say it twice
 in your advice for b ii you could maybe state the frequncy of outcome a bit clearer and after the equation
 maybe in your advice you could adapt it when the fraction can't be simplified to simply say it is in it's simplest form
 in advice for the last part you can omit 'using the experimental data' as you say it twice
Hannah Aldous 2 years, 6 months ago
Gave some feedback: Has some problems
Elliott Fletcher 2 years, 6 months ago
Gave some feedback: Needs to be tested
Elliott Fletcher 2 years, 7 months ago
Created this.Name  Status  Author  Last Modified  

Calculating Expected Values given a table of probabilities  Ready to use  Elliott Fletcher  20/11/2019 14:34  
Calculating expected values given a table of probabilities  Needs to be tested  Lauren Frances Desoysa  21/08/2018 15:22  
NumericalReasoning15  draft  Raymond Corrigan  16/09/2018 00:50  
NumericalReasoning16  draft  Raymond Corrigan  18/09/2018 12:05  
NumericalReasoning17  draft  Raymond Corrigan  18/09/2018 12:13  
Michael's copy of Calculating Expected Values given a table of probabilities  draft  Michael Proudman  19/11/2018 12:02  
Calculating expected values given a table of probabilities  draft  Ryan Poling  27/01/2019 16:37  
Simon's copy of Calculating Expected Values given a table of probabilities  draft  Simon Thomas  13/05/2019 09:55 
No variables have been defined in this question.
This variable doesn't seem to be used anywhere.
Name  Type  Generated Value  

Error in variable testing condition
There's an error in the condition you specified in the Variable testing tab. Variable values can't be generated until it's fixed.
No parts have been defined in this question.
Select a part to edit.
Ask the student a question, and give any hints about how they should answer this part.
Pattern restriction
Variables
String restrictions
Answers  

Choices 
Test that the marking algorithm works
Check that the marking algorithm works with different sets of variables and student answers using the interface below.
Create unit tests to save expected results and to document how the algorithm should work.
There's an error which means the marking algorithm can't run:
Name  Value  

Note

Value  Feedback 


Click on a note's name to show or hide it. Only shown notes will be included when you create a unit test.
Unit tests
No unit tests have been defined. Enter an answer above, select one or more notes, and click the "Create a unit test" button.
The following tests check that the question is behaving as desired.
This test has not been run yet This test produces the expected output This test does not produce the expected output
This test is not currently producing the expected result. Fix the marking algorithm to produce the expected results detailed below or, if this test is out of date, update the test to accept the current values.
One or more notes in this test are no longer defined. If these notes are no longer needed, you should delete this test.
Name  Value 

Note  Value  Feedback  

This note produces the expected output  Current: 


Expected: 

This test has not yet been run.
When you need to change the way this part works beyond the available options, you can write JavaScript code to be executed at the times described below.
To account for errors made by the student in earlier calculations, replace question variables with answers to earlier parts.
In order to create a variable replacement, you must define at least one variable and one other part.
Variable  Answer to use  Must be answered?  

The variable replacements you've chosen will cause the following variables to be regenerated each time the student submits an answer to this part:
These variables have some random elements, which means they're not guaranteed to have the same value each time the student submits an answer. You should define new variables to store the random elements, so that they remain the same each time this part is marked.
to
This question is used in the following exams:
 Probability by Elliott Fletcher in Elliott's workspace.
 Probability by Elliott Fletcher in Elliott's workspace.
 Calculate measures of central tendency and spread by Christian LawsonPerfect in Transition to university.
 Probability by Christian LawsonPerfect in Transition to university.
 WBL Level 2 Diagnostic Assessment by john halder in john's workspace.
 WBL Level 2 Diagnostic Assessment by john halder in john's workspace.
 Introduction to Probability by Robert Aykroyd in Robert's workspace.
 Probability by steve kilgallon in Stats and probability.
 Introduction to Probability by Katie Bullen in Katie's workspace.
 Nick's copy of Calculate measures of central tendency and spread by Nick Walker in Nick's workspace.
 Calculate measures of central tendency and spread by Paul Emanuel in Paul's workspace.
 NUMBAS  Probability by Katy Dobson in Katy's workspace.
 NUMBAS Averages by Katy Dobson in Katy's workspace.
 Measures of central tendency and spreadoriginal without context by Chris Graham in Newcastle University Sports Science.
 Harry's copy of Measures of central tendency and spreadoriginal without context by Harry Flynn in Harry's workspace.
 Harry's copy of Calculate measures of central tendency and spread by Harry Flynn in Harry's workspace.
 Miscellaneous by Mario Orsi in Mario's workspace.
 Probability by Simon Thomas in Stats.
 Maria's copy of Introduction to Probability by Maria Aneiros in Maria's workspace.
 Ollie's copy of Harry's copy of Calculate measures of central tendency and spread by Ollie Bartlett in Ollie's workspace.
 CMPU2012CA by Blathnaid Sheridan in Blathnaid's workspace.