Consider a normal population distribution with the value of σ known.USE SALT(a) What is the confidence level for the interval x ± 2.880/√n? (Round your answer to one decimal place.)%(b) What is the confidence level for the interval x± 1.450/√n? (Round your answer to one decimal place.)%(c) What value of Za/2 in the CI formula below results in a confidence level of 99.7%? (Round your answer to two decimal places.)(x-σσx +'a/2Za/2=(d) Answer the question posed in part (c) for a confidence level of 70%. (Round your answer to two decimal places.)Za/2=You may need to use the appropriate table in the Appendix of Tables to answer this question.

(a) using Z table For z = 2.88 We have probability of 0.996 (b) For z = 1.45 We have probability of…

Answered: Consider a normal population…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Consider a normal population distribution with the value of a known. (a) What is the confidence level for the interval x + 2.880/√n? (Round your answer to one decimal place.) USE SALT (b) What is the confidence level for the interval X ± 1.490/√n? (Round your answer to one decimal place.) Zx/2 % (c) What value of z % = in the CI formula below results in a confidence level of 99.7%? (Round your answer to two decimal places.) α/2 (x-20/2₁X+²0/12) (d) Answer the question posed in part (c) for a confidence level of 70%. (Round your answer to two decimal places.) ²α/2 You may need to use the appropriate table in the Appendix of Tables to answer this question.
the distribution of scores on a standardized test is approximately Normal with standard deviation of σ = 21. If a sample of 135 students had a mean score of x¯ = 73.6, use this to find a 99% confidence interval for the mean score of all students on this test. We are 99% confident that the the mean score of students on this test was in the interval ______ to _____. What is the margin of error for your confidence interval? Margin of error =
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Solve for D
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