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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?

1. 2.80 to 10.80
2. 3.36 to 11.36
3. 4.90 to 11.10
4. 3.98 to 11.98

Answer: 4.90 to 11.10

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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. Next how would you calculate the 95% confidence intervals?	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?