Question
A science teacher gives a test with 15 questions. This teacher is a hard grader. The teacher assigns points in the following manner: a correct
A science teacher gives a test with 15 questions. This teacher is a hard grader.
The teacher assigns points in the following manner: a correct answer = +1 point, an incorrect answer = -1 point, no answer = 0 points.
So scores on the test could range from +15 to -15. The teacher's assistant calculates the standard deviation for scores on the test and reports SD = -2.3.
What can we conclude given a standard deviation of -2.3?
Group of answer choices
Most students scored below the mean.
The standard deviation was calculated incorrectly.
Most students received negative scores.
There is an outlier that has a negative value close to -15
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