A study to see how well marital dissolution was predicted by the personality scores of husbands and wives was published in the Journal of Personality and Social Psychology. A random selection of 286 newlywed couples was made. After 5 years, 222 couples remained together and 64 had dissolved their marriages. The mean age of the husband in the 222 stable marriages was 30.47, and the standard deviation was 7.65. For the 64 unstable couples, the mean age of the husband was 29.64, and the standard deviation was 6.83. Test the hypothesis at the .01 level that there's no difference in the the population mean age of the husband in the two types of couples.