NumericAssessment > NumericChoice > NumericAnswer

Class: Chunk OboNode  Full Name: ObojoboDraft.Chunks.NumericAssessment.NumericAnswer

This represents one possible answer (correct or incorrect) for a numeric question.

Properties

Property Required Type Description
requirement Recommended String Default: “exact”. Determines how to potentially match student input to this answer choice.

Supported values for requirement

Requirement Type Description
exact Exact means that only student responses that represent the exact same value are allowed. For example, an exact answer of 4 will match against student responses for 4, 4.0, 8/2, but not for 4.01.
range Range accepts a range of answers, for example, all numbers -1 to 1. This would match student responses of -1, 1, 0, 1/1, 1/2, but not -1.1 or 2 for example.
margin Margin allows you to define an answer with an accepted margin of error - either absolute or percent error. For example, an answer of 100 with a 5% margin of error would accept student responses for 100 as well as 100.2, but not 120.

Additional properties when requirement is “exact”

Property Required Type Description
answer Required Answer String The numeric value of this answer choice

Additional properties when requirement is “range”

Property Required Type Description
start Required Answer String The starting numeric value for this answer range
end Required Answer String The ending numeric value for this answer range

Additional properties when requirement is “margin”

Property Required Type Description
answer Required Answer String The numeric value of this answer choice
type Required String The type of error, percent or absolute
margin Required String Either the percent or absolute error amount allowed

Format of Answer Strings

Answers can be decimal numbers, in scientific notation, fractions, hexadecimal numbers, octal numbers or binary numbers. Leading zeroes are ignored. Some examples are provided:

Answer string example Parsed as Subtype Equivalent decimal value Note
0 decimal   0  
01.230 decimal   1.230 Trailing zeroes are kept for significant figure purposes
100. decimal   100. Trailing “.” is kept for significant figure purposes
1/2 fraction   0.5  
-2/4 fraction   -0.5 Non-reduced fractions are allowed
1/3 fraction   0.333333…  
6.02e24 scientific e 6020000000000000000000000  
60.2e23 scientific e 6020000000000000000000000 Improper form (more than one digit to the left of the decimal) is allowed
6.02*10^24 scientific asterix 6020000000000000000000000  
6.02ee24 scientific ee 6020000000000000000000000  
6.02’24 scientific apos 6020000000000000000000000  
6.02x10^24 scientific x 6020000000000000000000000  
0xFF0F hexadecimal hexZeroX 65295  
#FF0F hexadecimal hexOctothorpe 65295  
$FF0F hexadecimal hexDollarSign 65295  
0o777 octal   511  
0b1101 binary   13  

Student input is matched to potential answer values by checking the equivalent decimal value. For example, if a possible answer value is “2”, student input of “2/1” is still accepted as a match as it is equivalent in value. An additional special case is afforded for fractional equivalency. If an answer value is “1/3”, student input of “0.333333” (or the same input with additional 3s) is considered equivalent (“0.33333” - an answer with five “3”s - is not). Likewise, student input of “1/3” will match against an answer value of “0.333333”.

Supported Trigger Types

Action Type Description
onMount Fired when a node is added to the DOM
onUnmount Fired when a node is removed from the DOM

Required Children

None

Variables Registered

None

Example

JSON

{
	"type": "ObojoboDraft.Chunks.NumericAssessment.NumericAnswer",
	"id": "...",
	"content": [
		{
			"requirement": "range",
			"start": "-1",
			"end": "1"
		}
	]
}

XML

<NumericAnswer requirement="range" start="-1" end="1" />