A school administrator wishes to conduct a poll to estimate the percentage of full-time college students who have credit-card debt of $2000 or more. What size sample should be obtained if she wishes the estimate to be within 2.5% percentage points with 94% confidence if (a) a prior study indicates that the percentage is 34%? (b) no prior estimates are used?

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A:

Q: What is the approximate sample size required to estimate the percentage of Americans who have earned…

A: When we don't have any prior information about the population proportion, we generally take it as…

Q: In a telephone survey of 1100 adults, 740 adults expressed concern about the future health of social…

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Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: It is given that the margin of error (E) is 0.08.

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given: Margin of error (E) =0.05. Confidence interval =95%. Z value for 95% confidence interval is…

Q: A researcher wants to estimate, at 92% confidence level, the prportion of covid-19 symptomatic…

A: Solution: From the given information, confidence level is 0.92 and E=0.03.

Q: An article in the October 11, 2006, issue of the Washington Post claimed that 15% of high school…

A:

Q: A recent survey asked the question, “Have you ever cut off communication with a family member…

A: Given that, p^=0.17,n=5592 Critical values: By using the standard normal table of Z, the critical…

Q: A consumer agency wants to estimate the proportion of all drivers who wear seat belts while driving.…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: The formula for the sample size is as follows: Here, zα/2 is the critical value at 99% confidence…

Q: If the candidate only wants a 3% margin of error at a 95% confidence level,

A: A political candidate has asked you to conduct a poll to determine what percentage of people support…

Q: You wish to determine what percentage of pre-kindergarten children ages 3 to 5 whose mother had a…

A: It is given that margin of error (E) is 0.05 and the confidence level is 0.90.

Q: A company wants to know what proportion of their customers plan to repurchase their product in the…

A:

Q: A national media outlet conducted a poll which estimated that 82% of all voters believed global…

A: Given, p=0.82 Margin of error = 0.02 Confidence level = 90% q=1-p =1-0.82 =0.18

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Determine the size of sample is needed. The size of sample is needed is obtained below as follows:…

Q: In a poll of 1000 randomly selected voters in a local election, 291 voters were against school bond…

A: From the provided information, Sample size (n) = 1000 291 voters were against school bond measures…

Q: By means of a pilot survey, it is already known that the proportion of residents in opposition to…

A: Formula for sample size is,

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: It is given that the confidence level is 0.90 and margin of error (E) is 0.01.

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Solution: From the given information, confidence level is 0.96 and E=0.02.

Q: According to a survey conducted by Pew Research Center in June 2009, 44% of people aged 18 to 29…

A:

Q: What should your sample size be if you want a confidence level of 90 percent and a margin of error…

A: We want to find the sample size (n)

Q: What happens to the sample size when you don’t know a prior sample proportion?

A: To calculate the sample size when we do not know prior sample proportion.

Q: The ACME computer company wanted to estimate the proportion of defective computers that are produced…

A: a) The interval (.024, .066) is the confidence interval for proportion of defectives. Thus the…

Q: It is estimated that 60 percent of U.S. households now get cable television. You would like to…

A: Solution: From the given information, confidence level is 0.95, p=0.60 and E=0.05.

Q: A quality controller wants to estimate the proportion of high quaity goods out of a batch of…

A:

Q: In a poll of 1000 randomly selected voters in a local election, 160 voters were in favor of fire…

A: Given,sample size (n)=1000no.of voters were in favor of fire department (x)=160α=1-0.99=0.01α2…

Q: A school administrator wishes to conduct a poll to estimate the percentage of full time college…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Here, there is no information about the population parameter. Hence, use the conservative estimate…

Q: What must be true about the sampling method and the values of p, q, and n in order to construct a…

A: For constructing Confidence interval for proportion, following assumptions need to be care

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Let P be the population proportion (might be a hypothesized value), p be the sample proportion and α…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Solution: From the given information, confidence level is 0.90 and E=0.06.

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is, Use EXCEL…

Q: in a study of government financial aid for college​ students, it becomes necessary to estimate the…

A:

Q: In a study, 68% of 908 randomly selected adults said they believe the Republicans favor the rich. If…

A: The margin of error, E is 0.04; sample proportion p-cap=0.68; and sample size, n is 908.

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given:Margin of error (E) = 0.09Confidence level = 90%Since, the proportion of people that support…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given that, If the prior information is unknown, assume that the sample proportion is, p^=0.50…

Q: The confidence interval was (64, 76) What was the point estimate? What was the margin of error?

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Find z-critical value:…

Q: An HR administrator wishes to know the proportion of employees that are currently using a very…

A: It is given that margin of error (E) is 0.14 and the confidence level is 0.80.

Q: In a recent poll of 200 randomly selected adults in the U.S., 130 were registered to vote. a) What…

A: Hello, thanks for your question. Since you have posted a question with multiple sub-parts, we will…

Q: The Labor Bureau wants to estimate, at a 90% confidence level, the proportion of all households that…

A: Computing the sample size: The confidence level is 90%. Therefore, α = 0.10 and α/2=0.05. The margin…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Here, there is no information about the population parameter. Hence, use the conservative estimate…

Q: A transportation planner wishes to estimate the proportion of commuters who drive to work within…

A: There is no specific information about the value of p. Hence, we can consider p as 0.5. A…

Q: A transportation planner wishes to estimate the proportion of commuters who drive to work within…

A: The provided information are: Margin of error (E) = 0.05 Confidence level = 90%

Q: A consumer agency wants to estimate the proportion of all drivers who wear seat belts while driving.…

A: It is given that the margin of error (E) is 0.49.

Q: Suppose we estimated that 68 percent of Santa Fe students believe that black coffee is disgusting.…

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Q: ays before the 2016 presidential election, a Loras College poll asked 500 randomly selected likely…

A: The confidence interval indicate that true proportion of voters who favor Donald Trump is 43% which…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.