A recipe calls for 2/3 cups of butter to make 2 1/2 cups of sauce
1 answer:
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Answer:
The minimum number of subjects needed is 385.
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:
95% confidence level
So , z is the value of Z that has a p-value of
, so
.
95% confidence, within 5 percentage points, and a previous estimate is not known.
The sample size is n for which M = 0.05. We don't know the true proportion, so we use
Then
Rounding up:
The minimum number of subjects needed is 385.
Answer: The margin of error =
Step-by-step explanation:
Given
Sample size (n) = 1000
Population proportion = 0.4
= 1 - confidence level
= 1 - 0.95
= 0.05
= 0.03
The margin of error change to to