What is 575% written as a mixed number
2 answers:
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Answer:
(9.6, 25.7) is a 80% confidence interval for the average net change in a student's score after completing the course.
Step-by-step explanation:
We have n = 6, and s = 13.3367. The confidence interval is given by
where
is the
th quantile of the t distribution with n-1=5 degrees of freedom. As we want the 80% confidence interval, we have that
and the confidence interval is
where
is the 10th quantile of the t distribution with 5 df, i.e.,
. Then, we have
and the 80% confidence interval is given by (9.6, 25.7)
Answer:
a) 752 medical files should be included.
b) 372 medical files should be included.
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 .
The margin of error is of:
90% confidence level
So , z is the value of Z that has a p-value of
, so
.
Question a:
This is n for which M = 0.03. We have no estimate, so we use . So
Rounding up:
752 medical files should be included.
Question b:
Now we have that:
So
Rounding up:
372 medical files should be included.