Question
Express the confidence interval29.7% 5.9%in interval form. We wish to estimate what percent of adult residents in a certain county are parents. Out of 300
- Express the confidence interval29.7% 5.9%in interval form.
- We wish to estimate what percent of adult residents in a certain county are parents. Out of 300 adult residents sampled, 105 had kids. Based on this, construct a 95% confidence interval for the proportion, p, of adult residents who are parents in this county.
< p <
3. Assume that a sample is used to estimate a population proportionp. Find the margin of errorM.E. that corresponds to a sample of size 148 with 74.3% successes at a confidence level of 95%.
M.E. =
4. Giving a test to a group of students, the grades and gender are summarized below
A | B | C | Total | |
Male | 11 | 3 | 8 | 22 |
Female | 16 | 20 | 4 | 40 |
Non-binary | 9 | 7 | 17 | 33 |
Total | 36 | 30 | 29 | 95 |
Letrepresent the percentage of all non-binary students who would receive a grade of C on this test. Use a 90% confidence interval to estimate p to three decimal places.
5. 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 99.9% confident that you estimate is within 3% of the true population proportion. How large of a sample size is required?
n =
6. If n=560 andp(p-hat) =0.31, find the margin of error at a 99% confidence level
Give your answer to three decimals
7. You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximatelyp=12% You would like to be 98% confident that your estimate is within 2% of the true population proportion. How large of a sample size is required?
n =
8. Express the confidence interval (65%,76%) in the form of p^ME.
9. Express the confidence interval 38.9%
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