Chapter 9, Problem 79H

In 1955, Life Magazine reported that the 25 year-old mother of three worked, on average, an 80 hour week. Recently, many groups have been studying whether or no the women’s movement has, In fact, resulted In an Increase In the average work week for women (combining employment and at-home work). Suppose a stud was done to determine If the mean work week has Increased. 81 women were surveyed with the following resuks. The sample mean was 83; the sample standard deviation was ten. Does It appear that the mean work week has Increased for women at the 5% level?