The 95% confidence interval for the population variance was found to be 9.25 to 34.13. However, we are to find a confidence interval for the population standard deviation. Recall that the standard deviation is the positive square root of the variance. Therefore, the confidence interval for the standard deviation can be fou by taking the positive square root of the lower and upper bounds for the variance. Substitute these values to find the lower bound for the confidence interval of the population standard deviation, rounding the result to one decimal place. lower bound of o = V lower bound of o2 Now find the upper bound for the confidence interval of the population standard deviation, rounding the resu to one decimal place. upper bound of o = V upper bound of at

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.