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If you sampled 1,000 people and found a mean income of $40,000 and a standard deviation...

If you sampled 1,000 people and found a mean income of $40,000 and a standard deviation of $1,500, what is the estimate of the standard error?

a. 47.43 b. 26.67 c. 150.0 d. 7.5

math   Statistics-And-Probability   
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