Research reported in the Professional Geographer

(May 1992) investigates the hypothesis that the disproportionate housework responsibility of women in twoincome households is a major factor in determining the proximity of a woman's place of employment. The researcher studied the distance (in miles) to work for both men and women in two-income households.

Random samples of men and women yielded the following results:

Central City Suburban Residence Residence ......................................................................

Men Women Men Women ............................................................................................................

Sample Size 159 119 138 93 Mean 7.4 4.5 9.3 6.6 Std. Deviation 6.3 4.2 7.1 5.6 -

a. For central city residences, calculate a 95% confidence interval for the average distance to work for men and women in two-income households. Interpret the intervals.

b. Repeat part a for suburban residences.

[Note: We will show how to use statistical techniques to compare two population means in Chapter 7.1