Question

1. In a group of 25 White patients diagnosed with pancreatic cancer at the County hospital, the average survival

time was 18.5 months. In a group of 10 Non-white patients diagnosed with pancreatic cancer at the County hospital, the average survival time was only 13.9 months. What is the average survival time for the entire group of 35 patients?

2.. Two young women are planning their fifth high school reunion. The mean age of the class at graduation was 18.1 years with a standard deviation of 0.35 years. The two, having completed a statistics course in college, are expert statisticians. Both women agree that five years after graduation the average age of the class will be 23.1 years but they disagree about the standard deviation of their ages. Lisa argues that since the mean age has increased the standard deviation must have increased. Kathryn disagrees. All members of the class are still alive. Please settle this disagreement as thoroughly as you can.

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