I just want to make sure if I'm doing these questions right. Thanks!
1) Looking at cancer data by county, a
researcher found that a small, rural county in the Midwest had the highest rate of kidney cancer. Another small, rural county had the lowest rate of kidney cancer. Give a plausible explanation for this.
I think The counties in which the incidence of kidney cancer is lowest are mostly rural, sparsely populated, and located in traditionally Republican states in the Midwest, the South, and the West and the counties in which the incidence of kidney cancer is highest. These ailing counties tend to be mostly rural, sparsely populated, and located in traditionally Republican states in the Midwest, the South, and the West. rural counties have relatively high poverty rates, high fat diet, lack of access to medication, etc.
2) What is the empirical rule for the normal distribution and how it can be used to identify when something is weird?
I think the empirical rule is just a vague estimate of probabilities for the normal distribution, it is mostly to help people get rough estimates of probabilities in their head. The empirical rule makes a statement about the normal distribution - that 68% of results are within 1 sd of the mean, 95% within 2 sd and 99.7% within 3 sd. but Im not sure if Im right.