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16 students were randomly selected from a large group of students taking a certain calculus test....

16 students were randomly selected from a large group of students taking a certain calculus test. The mean score for the students in the sample was 86 and the standard deviation was 1.2. Assume that the scores are normally distributed. Construct a 98% confidence interval for the mean score, μ, of all students taking the test. Round your answer to two decimal places.

a- (85.30 , 86.70)

b- (85.22 , 86.78)

c- (85.36 , 86.64)

d- (85.28 , 86.72)

Math   Statistics-And-Probability   
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Answer #1

Refer t-table or use excel function "=T.INV.2T(0.02,15)" to find the value of t.

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