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What is the confidence level for the interval ?̅±1⋅44 ?/√? ? step by step in detail,...

What is the confidence level for the interval ?̅±1⋅44 ?/√? ?

step by step in detail, please (which table to use and how to get the value?) !!!

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Answer #1

Solution:

The confidence interval for the mean using z distribution is given by

Sample mean Margin of error

Comparing with given interval , we can say

= 1.44

See the z table. See the column of z and go to 1.4 .then see the corresponding value in the row at .04 .This value is 1 - (/2)

So ,

1 - (/2) =  0.9251

(/2) = 0.0749

= 0.1498

Now ,

Confidence level c = 1 - = 1 - 0.1498 = 0.8502 = 85.02% = 85%

Answer : Confidence Level is 85%

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