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In another study you have a standard deviation of 12, a mean of 20 and a sample size of 50. What is the standard error?

1. 0.089
2. 0.069
3. 1.7
4. 0.589

Answer: 1.7

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Finally, you still have the same data (a sample size of 7, a mean of 8 and a standard deviation of 4.2) plus the standard error and you know how to calculate the 95% confidence interval. Thus what is the 95% confidence interval?	The standard error has been calculated as 2.6 and the sample mean is 10.00. Thus the 95% confidence interval lies between: