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corbin3582
14.04.2020 •
Mathematics
A sample of 300 FM residents was taken and 135 said their favorite season was summer. Calculate a 99% confidence interval for the proportion of FM residents whose favorite season is summer. What is the lower bound of this interval? (Round your answer to 3 decimal places and enter it with a leading 0. ex: 0.XXX).
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Ответ:
The 99% confidence interval for the proportion of FM residents whose favorite season is summer is between (0.376, 0.524).
The lower bound of this interval is 0.376.
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:
99% 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 99% confidence interval for the proportion of FM residents whose favorite season is summer is between (0.376, 0.524).
The lower bound of this interval is 0.376.
Ответ:
3,840
Step-by-step explanation: 10 X 8=80,12 X 4=48