7) A group of 39 randomly selected students have a mean score of 19.5 with a standard deviation of 3.2 on a placement test. What is the 99% confidence interval for the mean score, μ, of all students taking the test?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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Chapter4: Equations Of Linear Functions
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7) A group of 39 randomly selected students have a mean score of 19.5 with
a standard deviation of 3.2 on
a placement test. What is the 99% confidence interval for the mean score, μ,
of all students taking the test?
O 27.9 μ< 31.9
O 18.2 μ< 20.8
28.2 μ< 30.8
O 18.1 μ< 20.9
Transcribed Image Text:7) A group of 39 randomly selected students have a mean score of 19.5 with a standard deviation of 3.2 on a placement test. What is the 99% confidence interval for the mean score, μ, of all students taking the test? O 27.9 μ< 31.9 O 18.2 μ< 20.8 28.2 μ< 30.8 O 18.1 μ< 20.9
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