A 2008 study in the J. Family Econ. Issues compared the work and home habits of female and male lawyers in Canada. All participants in the survey had at least one child; single parents and couples who are both lawyers were excluded. Two of the variables measured were the weekly number of hours spent in the office and the number of hours spent with their children on weekdays.

a. Estimate, with 95% confidence, the difference in the average weekly number of work hours between mothers and fathers who practice law.
b. Estimate, with 95% confidence, the difference in the average number of hours female and male lawyers spend with their kids on weekdays. Then, convert this interval into an estimate for the difference in average weekly hours spent with kids.

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Weekly work hours n Mean Mothers 230 41.38 Fathers 604 48.09 SD 11.90 10.30 Weekday hours w/kids Mean 3.27 1.82 SD 1.68 1.29