The standard error has been calculated as 2.6 and the sample mean is 10.00. Thus the 95% confidence interval lies between:

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1. 4.904 to 15.096
2. 7.40 to 12.60
3. 3.85 to 26
4. There is not enough information available to work out the confidence interval.

Answer: 4.904 to 15.096
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