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In constructing a 95% confidence level estimate of the mean when the population standard deviation (σ)...

In constructing a 95% confidence level estimate of the mean when the population standard deviation (σ) is known what will be your z score used in the formula?

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Answer #1

When the population standard deviation (σ) is known,

a 95% confidence level estimate of the mean

where is the upper 0.025 point of a standard normal distribution i.e.

(found from standard normal table)

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