Item: tSolveArithmetic1b
Stem:
Which of the following is not an arithmetic sequence?
Options:
1, 3, 5, 7, ...
4, 9, 14, 19, ...
3, 6, 12, 24, ...
10, 20, 30, 40, ...
Key:
- Observable: 3.
Score: 1;
Evidence Value: 1.
-
Student:Right! You found what is called a geometric sequence.
-
Teacher:The student got this item correct.
- Observable: .
Score: 0;
Evidence Value: 0.
-
Student:Sorry, that's not right. Notice the common difference between each pair of numbers
in the sequence you selected. That means that it IS an arithmetic sequence.
-
Teacher:Not sure what the problem is.
Metadata:
Item Node: tSolveArithmetic1b,
Difficulty: 1.
Proficiencies: Arithmetic.