Are women marrying at a later age? A report stated that in 1970 (based on census data) the mean age of brides marrying for the first time was 20.8 years. In 1990, a random sample of 100 brides had a mean of 23.9 years with standard deviation of 6.4. Is there sufficient evidence to support the claim that in 1990 women were marrying later in life than in 1970?