(3.3.9) Consider a value to be significantly low if its z score less than or equal to -2 or consider a value to be significantly high if its z score is greater than or equal to 2.
A test is used to assess readiness for college. In a recent year, the mean test score was 20.5 and the standard deviation was 4.9. Identify the test scores that are significantly low or significantly high.
What test scores are significantly low?
Test scores that are between and
1
Expert's answer
2020-11-20T08:45:24-0500
"Sd=4.9"
"2sd=2\u00d74.9=9.8"
Scores that are greater than "20.5+9.8=30.3" are significantly high.
Scores that are less than "20.5-9.8=10.7" are significantly low.
Thus, scores between 10.7 and 30.3 are not significantly low or significantly high
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