a. Assume that a sample is used to estimate a population proportion p. Find the 95% confidence interval for a sample of size 198 with 42 successes.
Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places.
95% C.I. =
b. A political candidate has asked you to conduct a poll to
determine what percentage of people support her.
If the candidate only wants a 0.5% margin of error at a 99%
confidence level, what size of the sample is needed?
Give your answer in whole people.
c. You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p*=70%p*=70%. You would like to be 99% confident that you estimate is within 1.5% of the true population proportion. How large of a sample size is required?
n =
d. You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the population proportion. You would like to be 95% confident that you estimate is within 0.2% of the true population proportion. How large of a sample size is required?
n =
Hint: Shouldn't the answer be a WHOLE NUMBER.
Do not round mid-calculation. However, use a critical value accurate to three decimal places.
(a)
0.155 | confidence interval 95.% lower |
0.269 | confidence interval 95.% upper |
(b) 66349
(c) 6193
(d) 240092
a. Assume that a sample is used to estimate a population proportion p. Find the 95%...
Assume that a sample is used to estimate a population proportion p. Find the 95% confidence interval for a sample of size 169 with 128 successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. C.I.
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p 0.35. You would like to be 96% confident that your esimate is within 2% of the true population proportion. How large of a sample size is required? Hint: Shouldn't the answer be a WHOLE NUMBER n=2390.171
Assume that a sample is used to estimate a population proportion p. Find the 99% confidence interval for a sample of size 305 with 168 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 95% confidence interval for a sample of size 155 with 20 successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. 95% C.I. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p = 72%. You would like to be 99% confident that your esimate is within 5% of the true population proportion. How large of a sample size is required? n= Do not round mid-calculation. Use a critical value accurate to three decimal places.
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Assume that a sample is used to estimate a population proportion p. Find the 99.9% confidence interval for a sample of size 104 with 90% successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. C.I.= License Points possible: 1 This is attempt 2 of 2. Assume that a sample is used to estimate a population proportion p. Find the 99.9% confidence interval for a sample of size 104 with 90% successes....
Assume that a sample is used to estimate a population proportion p. Find the 99% confidence interval for a sample of size 144 with 34% successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. 99% C.I. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p = 0.78. You would like to be 99% confident that your esimate is within 4% of the true population proportion. How large of a sample size is required?