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A sample of 196 observations showed an average of 15 and a standard deviation of 26. Construct the 88% confidence interval for the population mean.

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A sample of 196 observations showed an average of 15 and a standard deviation of 26. Construct the 88% confidence interval for the population mean. What is the lower limit of this interval? NOTE: WRITE YOUR ANSWER USING 4 DECIMAL DIGITS. DO NOT ROUND UP OR DOWN

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