A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is 𝜎 = 7. (Round your answers to two decimal places.) (a) What is the standard error of the mean, 𝜎x? (b) At 95% confidence, what is the margin of error?
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3246 𝜎x ≈ 1.11 Show more…
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A simple random sample of 20 items resulted in a sample mean of 25. The population standard deviation is σ = 7. (Round your answers to two decimal places.) (a) What is the standard error of the mean, σx? (b) At 95% confidence, what is the margin of error
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