1. The center for Disease Control and Prevention wishes to estimate what proportion of the U....
1. The center for Disease Control and Prevention wishes to estimate what proportion of the U. S.
population gets the flu each year. In a random sample of adults in the U.S. collected in the year
2012, 12% got the flu that year.
(a) Based on the information from the past sample in 2012, how large of a sample is needed to
achieve a 0.02 margin of error with a 95% confidence level?
(b) Using the most conservative approach, how large of a sample is needed to achieve a 0.02
margin of error with a 95% confidence level?
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1. The center for Disease Control and Prevention wishes to
estimate what proportion of the U....
The center for Disease Control and Prevention wishes to estimate what proportion of the U. S....
The center for Disease Control and Prevention wishes to estimate what proportion of the U. S. population gets the flu each year. In a random sample of adults in the U.S. collected in the year 2012, 12% got the flu that year. (a) Based on the information from the past sample in 2012, how large of a sample is needed to achieve a 0.02 margin of error with a 95% confidence level? (b) Using the most conservative approach, how large...
In a prior sample of us adults the center for disease control found that 10% of...
In a prior sample of us adults the center for disease control found that 10% of the people in this sample had pin worms but the margin of error for the population estimate was too large. They want the margin of error to be 2% at the 95% confidence level. a) what is the minimum sample size required to obtain this type of accuracy? Use the prior sample proportion in your calculation b) what is the minimum sample size required...
Pinworm: In a prior sample of U.S. adults, the Center for Disease Control (CDC), found that...
Pinworm: In a prior sample of U.S. adults, the Center for Disease Control (CDC), found that 10% of the people in this sample had pinworm but the margin of error for the population estimate was too large. They want an estimate that is in error by no more than 2.5 percentage points at the 90% confidence level. Enter your answers as whole numbers. (a) What is the minimum sample size required to obtain this type of accuracy? Use the prior...
1. Find the sample size needed to estimate the proportion of houses that have security systems...
1. Find the sample size needed to estimate the proportion of houses that have security systems if the sample proportion h = 0.19, the margin of error is 0.02, and the confidence level is 90%. 2. Suppose that in a random sample of 50 adults, 41 were registered to vote. Construct a 95% confidence level interval for the population proportion of registered voters.
2. A researcher wishes to estimate the population proportion of adults who are confident in the...
2. A researcher wishes to estimate the population proportion of adults who are confident in the U.S. banking system. He wishes to estimate the proportion to within 3% with 95% confidence. How many adults should be included in the sample? A. 384 B. 385 C. 73 D. 1068 E. Insufficient information to answer the question
A researcher at a major hospital wishes to estimate the proportion of the adult population of the U
A researcher at a major hospital wishes to estimate the proportion of the adult population of the U.S. that has high blood pressure. How large a sample is needed in order to be 99% confident that the sample proportion will not differ from the tgrue proportion by more than 4%?
A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size...
A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size sample should be obtained if she wishes to estimate to be within 0.02 with 95% confidence if (a) She uses a previous estimate of 0.38? (b) she does not use any prior estimates?
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size...
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.02 with 95% confidence if (a) she uses a previous estimate of 0.42? (b) she does not use any prior estimates?
A pollster wishes to estimate, with 95% confidence, the proportion of people who approve of how...
A pollster wishes to estimate, with 95% confidence, the proportion of people who approve of how President Trump is performing his job. Find the minimum sample size necessary to achieve a margin of error of less than 3%. Assuming no previous estimates are available. Round your answer up to the next integer. Assuming a previous estimate of 0.90. Round your answer up to the next integer
1. The Centers for Disease Control reported the percentage of people 18 years of age and...
1. The Centers for Disease Control reported the percentage of people 18 years of age and older who smoke (CDC website, December 14, 2014). Suppose that a study designed to collect nevw data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of 0.30. a) b) c) How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of 0.02? Use 95% confidence Assume that the...
1. Find the sample size needed to estimate the proportion of houses that have security systems if the sample proportion h = 0.19, the margin of error is 0.02, and the confidence level is 90%. 2. Suppose that in a random sample of 50 adults, 41 were registered to vote. Construct a 95% confidence level interval for the population proportion of registered voters.
2. A researcher wishes to estimate the population proportion of adults who are confident in the U.S. banking system. He wishes to estimate the proportion to within 3% with 95% confidence. How many adults should be included in the sample? A. 384 B. 385 C. 73 D. 1068 E. Insufficient information to answer the question
1. The Centers for Disease Control reported the percentage of people 18 years of age and older who smoke (CDC website, December 14, 2014). Suppose that a study designed to collect nevw data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of 0.30. a) b) c) How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of 0.02? Use 95% confidence Assume that the...
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