Ask Question
20 July, 12:21

Thirty randomly selected students took the calculus final. If the sample mean was 89 and the standard deviation was 6.2, construct a 99% confidence interval of the mean score of all students. Assume that the population has a normal distribution

+5
Answers (1)
  1. 20 July, 15:56
    0
    For the answer to the question above asking If the sample mean was 89 and the standard deviation was 6.2, construct a 99% confidence interval of the mean score of all students. Assume that the population has a normal distribution

    z=2.57 cuts off. 005 in each tail of the standard normal distribution

    99% CI is 89 + / - 2.57 (6.2) / sqrt (30) = 89 + / - 2.909, or from 86.09 to 91.91
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “Thirty randomly selected students took the calculus final. If the sample mean was 89 and the standard deviation was 6.2, construct a 99% ...” in 📘 Mathematics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers