In a poll to estimate presidential popularity, each person in a random sample of
ID: 2945805 • Letter: I
Question
In a poll to estimate presidential popularity, each person in a random sample of 1,390 voters was asked to agree with one of the following statements:
A total of 600 respondents selected the first statement, indicating they thought the president was doing a good job.
Construct a 98% confidence interval for the proportion of respondents who feel the president is doing a good job. (Use z Distribution Table.) (Round your answers to 3 decimal places.)
Based on your interval in part (a), is it reasonable to conclude that a majority of the population believes the president is doing a good job?
In a poll to estimate presidential popularity, each person in a random sample of 1,390 voters was asked to agree with one of the following statements:
Explanation / Answer
The statistical software output for this problem is:
One sample proportion summary confidence interval:
p : Proportion of successes
Method: Standard-Wald
98% confidence interval results:
Hence,
a) 98% confidence interval:
0.401 upto 0.463
b) No
Proportion Count Total Sample Prop. Std. Err. L. Limit U. Limit p 600 1390 0.43165468 0.013285166 0.40074876 0.46256059Related Questions
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