In 1995, life magazine reported that the 25 year-old mother of three worked, on average, an 80 hour a 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. suppose a study was done to determine if the mean work week has increased. 81 women were surveyed with the following results. the sample mean was 83; the sample standard deviation was 10. does it appear that the mean work week has increased for women at the 5% level?