In 1955, Life Magazine reported that the 27 year-old mother of three worked, on average, an 75 hour week. Recently, many groups have been studying whether or not the women's movement has, in fact,...

Extracted text: In 1955, Life Magazine reported that the 27 year-old mother of three worked, on average, an 75 hour week. Recently, many groups have been studying whether or not 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 study was done to determine if the mean work week has increased. 85 women were surveyed with the following results. The sample mean was 80; the sample standard deviation was ten. Does it appear that the mean work week has increased for women at the 5% level?