Suppose the annual expected mortality rate from coronary disease is 500 per 100,000 individuals. In a specific community of 600,000 individuals, how many deaths are expected to be attributed to coronary heart disease over a one year period?

Question

Suppose the annual expected mortality rate from coronary disease is 500 per 100,000 individuals. In a specific community of 600,000 individuals, how many deaths are expected to be attributed to coronary heart disease over a one year period?

my work: 600,000/100,000=6
6x500= 3000

The actual (observed) number of deaths attributed to coronary heart disease in the community was 4,500 individuals over a 1 yr period. what would be the observed/expected ratio for these deaths? reduce to simplest form.
my work: 4,500/3000 =1.5 more

of the 4,500 individuals that died form coronary heart disease, it was determined that twice the number of makes died from it than females. How many makes died from coronary heart disease?
my answer: 3000 men

could someone double check me please? thanks

Answer 1

Your answer to a) is correct, but I find your order of arithmetic odd.

I would have found the probability of disease first
= 500/100000
= 1/200
then number of expected deaths
= (1/200)(600,000) = 3000

b) ratio of observed : expected
= 4500 : 3000
= 3 : 2
(it asked for the ratio)

c) number of females --- x
number of males ---- 2x
x + 2x = 4500
3x = 4500
x = 1500

so 1500 females and 3000 males died
You were correct

Answer 2

Your calculations for the first two questions are correct:

1. To calculate the expected number of deaths, you multiplied the annual mortality rate (500 per 100,000) by the total number of individuals in the community (600,000/100,000 = 6). So, 6 x 500 = 3000 expected deaths.

2. The observed/expected ratio is calculated by dividing the observed number of deaths (4500) by the expected number of deaths (3000). So, 4500/3000 = 1.5.

Now let's move on to the third question:

It is given that twice the number of males died from coronary heart disease compared to females. Since the ratio of male to female deaths is 2:1, we can calculate as follows:

Let's assume the number of female deaths is x. Then, the number of male deaths would be 2x (twice the number of females).

So, x + 2x = 4500 (total observed deaths)
3x = 4500
x = 1500

So, the number of male deaths is 2x = 2 * 1500 = 3000.

Therefore, based on these calculations, your answer of 3000 men dying from coronary heart disease is correct.