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The standard deviation of a sample proportion p gets smaller as the sample size n increases....
Question Part Points Submissions Used The standard deviation of a sample proportion p̂ gets smaller as...
Question Part Points Submissions Used The standard deviation of a sample proportion p̂ gets smaller as the sample size n increases. If the population proportion is p = 0.58, how large a sample is needed to reduce the standard deviation of p̂ to σp hat = 0.004? (The 68−95−99.7 rule then says that about 95% of all samples will have p̂ within 0.01 of the true p. Round your answer to up to the next whole number.)
14. Selecting the sample size to estimate a proportion Aa Aa Standard Normal Mean-0 Standard Deviation-1...
14. Selecting the sample size to estimate a proportion Aa Aa Standard Normal Mean-0 Standard Deviation-1 5000 2500 2500 2 ?? 0.674 0.674 The Council of Economic Advisers is conducting a study to estimate the proportion of U.S. households that are eligible for the earned income tax credit. The project manager wants to estimate the proportion to within 0.03 with 95% confidence, and the project manager believes that p will turn out to be approximately 0.13. A sample size no...
a random sample of size n 200 is taken and the sample proportion p = 0.21
Pg 417 6.47 For a hypothesis test H0: p = 0.3 Ha: p < 0.3 a random sample of size n 200 is taken and the sample proportion p = 0.21 (a) Determine whether it is appropriate to use the normal distribution to estimate the p-value. (b) If it is appropriate to use a normal distribution, complete the test for a significance level of 5% Pg 418 6.55 Home Field in Baseball 2009 There were 2430 Major League Baseball games played in 2009, and the home team won the...
a. Assume that a sample is used to estimate a population proportion p. Find the 95%...
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...
Please provide as much detail as possible!!! 5.26 What is wrong? Explain what is wrong in...
Please provide as much detail as possible!!!
5.26 What is wrong? Explain what is wrong in each of the following statements. (a) The central limit theorem states that for large n, the population mean u is approximately Normal. (b) For large n, the distribution of observed values will be approximately Normal. (c) For sufficiently large n, the 68–95–99.7 rule says that I should be within u + 20 about 95% of the time. (d) As long as the sample size...
To estimate the mean score μ of those who took the Medical College Admission Test on...
To estimate the mean score μ of those who took the Medical College Admission Test on your campus, you will obtain the scores of an SRS of students. From published information you know that the scores are approximately Normal with standard deviation about 6.2. You want your sample mean x to estimate ,1 with an error of no more than 0.8 point in either direction. (a) What standard deviation must x have so that 99.7% of all samples give an...
28. test A population proportion is .40. A random sample of size 200 will be taken...
28. test A population proportion is .40. A random sample of size 200 will be taken and the sa proportion p will be used to estimate the population proportion. a. What is the probability that the sample proportion will be within +.03 of the popu tion proportion? b. What is the probability that the sample proportion will be within +.05 of the popula- tion proportion? Aceume that the population proportion is .55. Compute the standard error of the proportion. 10
Score: 0 of 1 pt For the provided sample mean, sample size, and population standard deviation,...
Score: 0 of 1 pt For the provided sample mean, sample size, and population standard deviation, complete parts (a) through (c) below. x#21,n-100, σ 2 Find a 95% confidence interval for the population mean. The 95% confidence interval is from | | to (Round to two decimal places as needed.) Enter your answer in the edit fields and then click Check Answer. parts remaining
For the provided sample mean, sample size, and population standard deviation, complete parts (a) through (c)...
For the provided sample mean, sample size, and population standard deviation, complete parts (a) through (c) below. Assume that x is normally distributed x= 27, n=9, 0 = 6 a. Find a 95% confidence interval for the population mean The 95% confidence interval is from to (Round to two decimal places as needed.) b. Identify and interpret the margin of error. The margin of error is (Round to two decimal places as needed.) Interpret the margin of error. Choose the...
A sample of size n=95 is drawn from a population whose standard deviation iso = 38....
A sample of size n=95 is drawn from a population whose standard deviation iso = 38. Part 1 of 2 (a) Find the margin of error for a 90% confidence interval for u. Round the answer to at least three decimal places. The margin of error for a 90% confidence interval for p is Part 2 of 2 (b) If the sample size were n = 62, would the margin of error be larger or smaller? (Choose one) , because...
14. Selecting the sample size to estimate a proportion Aa Aa Standard Normal Mean-0 Standard Deviation-1 5000 2500 2500 2 ?? 0.674 0.674 The Council of Economic Advisers is conducting a study to estimate the proportion of U.S. households that are eligible for the earned income tax credit. The project manager wants to estimate the proportion to within 0.03 with 95% confidence, and the project manager believes that p will turn out to be approximately 0.13. A sample size no...
Please provide as much detail as possible!!!
5.26 What is wrong? Explain what is wrong in each of the following statements. (a) The central limit theorem states that for large n, the population mean u is approximately Normal. (b) For large n, the distribution of observed values will be approximately Normal. (c) For sufficiently large n, the 68–95–99.7 rule says that I should be within u + 20 about 95% of the time. (d) As long as the sample size...
To estimate the mean score μ of those who took the Medical College Admission Test on your campus, you will obtain the scores of an SRS of students. From published information you know that the scores are approximately Normal with standard deviation about 6.2. You want your sample mean x to estimate ,1 with an error of no more than 0.8 point in either direction. (a) What standard deviation must x have so that 99.7% of all samples give an...
28. test A population proportion is .40. A random sample of size 200 will be taken and the sa proportion p will be used to estimate the population proportion. a. What is the probability that the sample proportion will be within +.03 of the popu tion proportion? b. What is the probability that the sample proportion will be within +.05 of the popula- tion proportion? Aceume that the population proportion is .55. Compute the standard error of the proportion. 10
Score: 0 of 1 pt For the provided sample mean, sample size, and population standard deviation, complete parts (a) through (c) below. x#21,n-100, σ 2 Find a 95% confidence interval for the population mean. The 95% confidence interval is from | | to (Round to two decimal places as needed.) Enter your answer in the edit fields and then click Check Answer. parts remaining
For the provided sample mean, sample size, and population standard deviation, complete parts (a) through (c) below. Assume that x is normally distributed x= 27, n=9, 0 = 6 a. Find a 95% confidence interval for the population mean The 95% confidence interval is from to (Round to two decimal places as needed.) b. Identify and interpret the margin of error. The margin of error is (Round to two decimal places as needed.) Interpret the margin of error. Choose the...
A sample of size n=95 is drawn from a population whose standard deviation iso = 38. Part 1 of 2 (a) Find the margin of error for a 90% confidence interval for u. Round the answer to at least three decimal places. The margin of error for a 90% confidence interval for p is Part 2 of 2 (b) If the sample size were n = 62, would the margin of error be larger or smaller? (Choose one) , because...
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