A sample has mean 50, population standard deviation 10, and size 100. Using z = 1.96, what is the 95% confidence interval for the population mean?
Correct answer: A. (48.04, 51.96)
- A. (48.04, 51.96)
- B. (49.80, 50.20)
- C. (46.08, 53.92)
- D. (40.00, 60.00)
Explanation
The standard error is 10 divided by the square root of 100, which equals 1. The interval is 50 plus or minus 1.96 times 1, giving (48.04, 51.96).
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