Beginner2021-08-09Added 1 answers
Total number of people is 2056.
The proportion of voters is (0.561, 0.599)
This is a symmetrical CI.
Hence the sample proportion is expressed as,
Length of CI is expressed as difference between given proportion.
Margin of error is expressed as,
Margin of error(E)
Hence the CI of the given proportion with margin of error is,
Hence, the proportions are (0.599,0.561)
The expression for standard deviation is,
As know that,
Margin of error
Hence, the value of z is,
Hence the confidence level is
Now, to find null hypothesis:
Here, sample proportion is
Hence the standard deviation at 0.65 claimed proportion,
So the value of
Hence, the value of z is -6.67.