at 6 am the temperature was -8ºC. In the afternoon, the temperature was +3ºC. What was the change of temperature during the day?
1 answer:
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Answer:
At sample size of 752 is needed.
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 zscore that has a pvalue of .
The margin of error is:
90% confidence level
So , z is the value of Z that has a pvalue of
, so
.
What size of sample is needed?
A sample size of n is needed.
n is found when M = 0.03.
We do not have a estimate for the true proportion, so we use , which is when we are going to need the largest sample size.
Rounding up
At sample size of 752 is needed.