A sample of male and female students were equipped with a device that records sound for one day. Data about number of words spoken per day are presented below: Mean Standard Deviation Males (n = 56) 16177 7520 Females (n = 56) 16569 9108 Construct a 99% confidence interval for the difference in the mean number of words spoken by males and females. Assume the population variances to be unknown and unequal. Provide the lower limit and upper limit.

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