Mathematics
27.09.2020 12:17
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Statistics students surveyed 135 students at Tallahassee Community College. From
Statistics students surveyed 135 students at Tallahassee Community College. From their data we are 95% confident that between 44.7% and 61.9% of all TCC students are female. The students realize that this interval contains a large margin of error. What can they do to make a narrower interval? Group of answer choices
a. Survey more students.
b. Use a 99% confidence level.
c. Survey more students and use a 99% confidence interval.
d. None of the other choices.
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a. Survey more students.
b. Use a 99% confidence level.
c. Survey more students and use a 99% confidence interval.
d. None of the other choices.
ashleyrichard29
4,5(18 marks)
a. Survey more students.
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 higher the confidene level, the higher the value of z is.
The margin of error is given by:
The smaller the margin of error, the narrower the interval is.
What can they do to make a narrower interval?
As we saw from the equation above, the margin of error decreases as the sample size increases.
So the correct answer is:
a. Survey more students.
sjsmith21
4,6(26 marks)
ED2
44444444444
DStep-by-step explanation:
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