Item: tExplicitArithmetic2b
Stem:
The first four terms of an arithmetic sequence are given below.
Choose the algebraic expression that represents the nth
term in this sequence.
3, 7, 11, 15, . . .
Options:
4n - 1
3n - 4
4n + 1
4n
4n + 3
Key:
- Observable: 1.
Score: 1;
Evidence Value: 1.
-
Student:Right! The expression you selected, 4n - 1, is correct.
-
Teacher:The student got this item correct.
- Observable: 2.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, the expression you selected, 3n - 4, is incorrect. The sequence in the question is: 3, 7, 11, 15,... But the expression you selected describes the sequence: -1, 2, 5, 8, ...
-
Teacher:The student did not get this item right.
- Observable: 3.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, the expression you selected, 4n + 1, is incorrect. The sequence in the question is: 3, 7, 11, 15,... But the expression you selected describes the sequence: 5, 9, 13, 17, ...
-
Teacher:The student did not get this item right.
- Observable: 4.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, the expression you selected, 4n, is incorrect. The sequence in the question is: 3, 7, 11, 15,... But the expression you selected describes the sequence: 4, 8, 12, 16, ...
-
Teacher:The student did not get this item right.
- Observable: 5.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, the expression you selected, 4n + 3, is incorrect. The sequence in the question is: 3, 7, 11, 15,... But the expression you selected describes the sequence: 7, 11, 15, 19, ...
-
Teacher:The student did not get this item right.
Metadata:
Item Node: tExplicitArithmetic2b,
Difficulty: 2.
Proficiencies: ExplicitArithmetic.