In the Statistics Norway on-line article The Times They Are a Changing, J. Kristiansen discussed the changes
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a. Decide, at the 1% significance level, whether the data provide sufficient evidence to conclude that the mean age of Norwegian men at the time of marriage exceeds that of Norwegian women.
b. Find and interpret a 99% confidence interval for the difference between the mean ages at the time of marriage for Norwegian men and women.
c. Remove the two paired-difference (potential) outliers and repeat parts (a) and (b). Compare your results to those in parts (a) and (b).
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