Assume that a sample is used to estimate a population proportion p. Find the 99% confidence interval for a sample of size 356 with 198 successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. C.I=
Assume that a sample is used to estimate a population proportion p. Find the 99% confidence interval for a
C.I=
Obtain the 99% confidence level estimate of the population proportion.
The 99% confidence level estimate of the proportion is obtained below:
Obtain the critical value of z at the 99% confidence level.
Here, confidence level is 0.99
Use EXCEL Procedure for finding the critical value of z.
Follow the instruction to obtain the critical value of z:
- Open EXCEL
- Go to Formula bar.
- In formula bar enter the function as“=NORMINV”
- Enter the probability as 0.995
- Enter the mean as 0 and the Standard deviation as 1.
- Click enter
EXCEL output:
From the EXCEL output, the critical value of z at the 99% confidence level is 2.576.
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