A random sample of 49 statistics examinations was taken. The average score, in the sample, was 84 with a variance of 12.25. The 95% confidence interval for the average examination score of the population of the examinations is
A. 83.45 to 84.55.
B. 80.07 to 87.93.
C. 83.29 to 84.71.
D. 80.5 to 87.5.
Answer: C
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A) is B) am
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