st23pgardner
09.12.2020 •
Mathematics
Solve for x
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Ответ:
Answer
go to the website symbolab math solver
Step-by-step explanation:
Ответ:
a) 95% confidence interval for the proportion of respondents who say the Internet has been a good thing for them personally:
b) 95% confidence interval for the proportion of respondents who say the Internet has strengthened their relationship with family and friends:
c) 95% confidence interval for the proportion of Internet users who say online groups have helped solve a problem:
d) margin of error for the interval estimates in parts (a) e=0.02, (b) e=0.05, and (c) e=0.06.
Step-by-step explanation:
a) We have a sample proportion of 90% (p=0.90).
The sample size is n=857.
For a 95% CI, the z-value is z=1.96.
The standard deviation for the proportion is:
Then the upper and lower limit of the 95% CI is:
b) We have a sample proportion of 67% (p=0.67).
The sample size is n=857.
For a 95% CI, the z-value is z=1.96.
The standard deviation for the proportion is:
Then the upper and lower limit of the 95% CI is:
c) We have a sample proportion of 56% (p=0.56).
The sample size is n=857.
For a 95% CI, the z-value is z=1.96.
The standard deviation for the proportion is:
Then the upper and lower limit of the 95% CI is:
d)
For a), the relative margin of error is:
For b), the relative margin of error is:
For c), the relative margin of error is: