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jaimefashion12
14.04.2020 •
Mathematics
A survey of 1295 student loan borrowers found that 460 had loans totaling more than $20,000 for their undergraduate education. Give a 98% confidence interval for the proportion of all student loan borrowers who have loans of $20,000 or more for their undergraduate education. (Give answers accurate to 3 decimal places.)
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Ответ:
The 98% confidence interval for the proportion of all student loan borrowers who have loans of $20,000 or more for their undergraduate education is (0.324, 0.386)
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
.
For this problem, we have that:
98% confidence level
So
, z is the value of Z that has a pvalue of
, so
.
The lower limit of this interval is:
The upper limit of this interval is:
The 98% confidence interval for the proportion of all student loan borrowers who have loans of $20,000 or more for their undergraduate education is (0.324, 0.386)
Ответ:
Total price $11.15
Step-by-step explanation:
Tip Total:$ 1.35
Total (Bill + Tip):$ 10.32
Sales tax: $0.83
Cost/Price before ST: $10.32
Total Cost/Price including ST: $11.15