Item: tSolveGeometricProblems3b
Stem:
Which of the following is not a geometric sequence?
Options:
Key:
- Observable: 2.
Score: 1;
Evidence Value: 1.
-
Student:You're right! You've correctly selected the sequence that is not geometric.
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Teacher:From among a set of options, the student was able to select the non-geometric sequence. The student was able to do this even though some of the sequences contain fractions and negative terms.
- Observable: 1.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, that's not right. The sequence
... is geometric. Since each term is equal to negative one-half times the previous term, this is a geometric sequence with a common ratio of -1/2.
-
Teacher:The student was not able to select a non-geometric sequence from among a set of options. Some of these sequences include fractions and negative terms; this may or may not be the source of the difficulty.
- Observable: 3.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, that's not right. The sequence
... is geometric. Since each term is equal to three halves times the previous term, this is a geometric sequence with a common ratio of 3/2.
-
Teacher:The student was not able to select a non-geometric sequence from among a set of options. Some of these sequences include fractions and negative terms; this may or may not be the source of the difficulty.
- Observable: 4.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, that's not right. The sequence
... is geometric. Since each term is equal to three halves times the previous term, this is a geometric sequence with a common ratio of 3/2.
-
Teacher:The student was not able to select a non-geometric sequence from among a set of options. Some of these sequences include fractions and negative terms; this may or may not be the source of the difficulty.
Metadata:
Item Node: tSolveGeometricProblems3b,
Difficulty: 3.
Proficiencies: solveGeometricProblems.