3. Of 1000 randomly selected cases of lung cancer, 450 resulted in death within 5 years. Calculate a 96% CI on the death rate from lung cancer.

The 96% CI on the death rate from lung cancer is (0.4177, 0.4823).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.

In which

z is the z-score that has a p-value of .

Of 1000 randomly selected cases of lung cancer, 450 resulted in death within 5 years.

This means that

96% confidence level

So , z is the value of Z that has a p-value of , so .  

The lower limit of this interval is:

The upper limit of this interval is:

The 96% CI on the death rate from lung cancer is (0.4177, 0.4823).

The parenthesis in any of these expressions cannot be removed without changing the value of expressions.

Step-by-step explanation:

Given:

A.   2[5 + (3)(2) + 4]

B.   2[(5 + 3)(2+4)]

C.   2[5 + 3(2 + 4)]

Now, by evaluating:

Symbols of multiplication are not shown sometimes in between parenthesis.

Therefore, the parenthesis in any of these expressions cannot be removed without changing the value of expressions.