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# Rates - PowerPoint PPT Presentation

Rates. STA 220 – Lecture #3. Rates. How do we compare the birth rate of a large country, such as China, with a small country, such as Iceland? How do we compare how much the state of California spends on education versus the amount spent by Wyoming?. Computation of Rates.

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### Rates

STA 220 – Lecture #3

• How do we compare the birth rate of a large country, such as China, with a small country, such as Iceland?

• How do we compare how much the state of California spends on education versus the amount spent by Wyoming?

• Rates are used instead of

• Suppose “x” rate we’re interested in was the birth rate of RI in 1999. Suppose that 12,000 babies were born in 1999 and that the population of RI was 1,000,000.

• Had we used the constant 10,000 then we would have 120 births per 10,000

• For consistency, the multiple of 1,000 has been adopted as the de facto standard for population rates

• When comparing rates,

• Population: 1,000,000

• Births: 12,000

• Deaths: 11,000

• Immigrants: 600

• Emigrants: 1,700

• Suppose you had the following birth rate information for CT and were asked to compute a regional birth rate for both RI and CT, combined.

• CT population: 8,000,000

• CT births: 160,000

What is CT’s birth rate?

• In the above rates, multiplying by 1000 generally made the rates meaningful

• Suppose the breast cancer death rate is 0.012 per 1,000 women…