The values provided in the above question asr as belows
Margin of error = E = 0.02
Confidence level = 90% = 0.90
The significant level of
= 1 - 0.90 = 0.10
We have to find the Zc using following command in Excel
For symmetric distribution we use significant level
/2 for finding critical value
critical value = Z/2
= Z0.05 = -1.645
We write
The formula is used for the finding the minimum sample size for this survey is as
Sample size =
n = 1691.266
(Sample size is always express in interger so we round up it in
interger value)
The minimum sample size for this survey is 1692
A newspaper wants to estimate the approval rating for the current president by using the confidence...
A newspaper reports that the governor's approval rating stands at 75%. The article adds that the poll is based on a random sample of 1,000 adults and has a margin of error of 2.0%. What level of confidence did the pollsters use? a. 85% b. 68% c. 93% d. 97% e. 90%
to estimate the next president’s approval rating how
many
AutoSave OFF ño su: Home work # 5 Tome Insert Draw Design Layout References » Tell me Share - A A Paste Font Paragraph Styles Dictate Sensitivity Create and Share Request Adobe PDF Signatures 2. To estimate the next president's final approval rating, how many (sample size) people should be sampled with margin of error 3% and 96% confidence level?
2pts, 1 for work) A 2011 NBC News survey found that 80% of a sample of 4500 American teens said they owned an MP3 player such as an ipod. Assume the sample is an SRS. Based on the sample, the 90% confidence interval for the proportion of teens who own an MP3 player is: a. 0.80 ± 0.0060 b. 0.80 ± 0.0117 c. 0.80 ± 0.0098 d. 0.80 ± 0.0071 3. (2pts, 1 for work) If we computed an 80%...
The Labor Bureau wants to estimate, at a 90% confidence level, the proportion of all households that receive welfare. The most conservative estimate of the sample size that would limit the margin of error to be within 0.034 of the population proportion is:
The Labor Bureau wants to estimate, at a 90% confidence level, the proportion of all households that receive welfare. The most conservative estimate of the sample size that would limit the margin of error to be within 0.034 of the population proportion is:
Suppose the U.S. president wants to estimate the proportion of the population that supports his current policy toward revisions in the health care system. The president wants the estimate to be within 0.03 of the true proportion. Assume a 90% level of confidence. The president’s political advisors found a similar survey from two years ago that reported that 40% of people supported health care revisions. (Use z Distribution Table.) How large of a sample is required? (Round up your answer...
Suppose the U.S. president wants to estimate the proportion of the population that supports his current policy toward revisions in the health care system. The president wants the estimate to be within 0.03 of the true proportion. Assume a 98% level of confidence. The president’s political advisors found a similar survey from two years ago that reported that 58% of people supported health care revisions. (20 pts) How large of a sample is required? How large of a sample would...
You would like to conduct a survey to estimate the average number of hours of sleep UWEC students get per night. You would like a 95% confidence interval whose width is no more than 0.5 hours. a. What is the margin of error, ?? b. What is ?, the level of significance that corresponds to the confidence level? c. What is the multiplier (??/2)? e. Find the smallest sample size that would be reasonable to achieve your goal of a...
(5) A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. He wants to construct the 75% confidence interval with a maximum error of 0.1 reproductions per hour. (a) Assuming that the mean is 6.1 reproductions and the variance is known to be 5.76, what is the minimum sample size required for the estimate? Round your answer up to the next integer. (6 points) (b) If one uses Chebyshev's Inequality (Law of Large...
24. Find the minimum sample size required to estimate a population proportion with a margin of error = 0.05 a confidence level of 90%, and from a prior study, p is estimated to be .25 (a) 203 (b) 329 (c) 247 (d) 396 (e) 289 25. In a survey of 385 students at Broward College, North Campus, results revealed that 154 students were born outside of the USA. Construct a 96% confidence interval estimate for the proportion of students who...