Asked by casey
Salaries of 50 college graduates who took a statistics course in college have a mean, x of $68,200. Assuming a standard deviation, σ, of $12,279, construct a 95% confidence interval for estimating the population mean μ.
Answers
Answered by
PsyDAG
95% = mean ± Z(SD)
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (±.025) and its Z score. Insert data into above equation and solve.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (±.025) and its Z score. Insert data into above equation and solve.
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