Test whether the 5-year survival rate for breast cancer is significantly different between African American and Caucasian women who are younger than 50 years of age and have localized disease. Provide a p-value (two-tailed).

The 5-year survival rates by stage of disease, age at diagnosis, and race are provided in Table 10.24.

Table 10.24: Five-year survival rates for breast cancer by stage at diagnosis, age at diagnosis, and race, SEER Cancer data, 1999ˆ’2005

  

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African American females Caucasian females 50+ 50+ <50 <50 (n = 53,060) (n = 174,080) (n = 16,300) Stage (n = 8063) Localized Regional Distant Unstaged 96.5* 84.6 33.2 94.9 99.6 85.0 22.5 91.6 72.6 16.4 71.3 15.0 49.7 53.5 42.2 76.7 *percent.