18. -/4 points DevoreStat9 7.E.001 Consider a normal population distribution wit

Question

18. -/4 points DevoreStat9 7.E.001 Consider a normal population distribution with the value of known (a) what is the confidence level for the interval x ± 2.88o/Vn? (Round your answer to one decimal place.) (b) what is the confidence level for the interval x ± 1.48o/Vn? (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-Za/2 Vn (d) Answer the question posed in part (c) for a confidence level of 75%. (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

Explanation / Answer

Answer ;

( a )

Confidence level corresponding to ( z = 2.88 ) = 99.81%

( b )

Confidence level corresponding to ( z = 1.48 ) = 93.06%

( c )

z score corresponding to 99.7 % confidence level = 2.7477

( d )

z score corresponding to 75 % confidence level = 0.6744

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