n1=685pˆ1=0.41n1=685p^1=0.41 n2=510pˆ2=0.23n2=510p^2=0.23 Use this data to find the 80%80% confidence interval for the true difference between the population proportions. Copy Data Step 3 of 3: Construct the 80%80% confidence interval. Round your answers to three decimal places.
n1=685pˆ1=0.41n1=685p^1=0.41 n2=510pˆ2=0.23n2=510p^2=0.23
Use this data to find the 80%80% confidence interval for the true difference between the population proportions.
Copy Data
Construct the 80%80% confidence interval. Round your answers to three decimal places.
Obtain the 80% confidence interval for the difference between two proportions.
The 80% confidence interval for the difference between two proportions is obtained below as follows:
The formula for the confidence interval is,
Use EXCEL Procedure to obtain the critical value of z.
Follow the below instruction to find the critical value of z:
- Open EXCEL
- Go to Formula bar.
- In formula bar enter the function as“=NORMINV”
- Enter the probability as 0.90.
- 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 80% confidence level is 1.282.
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