Aresearcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 3 percentage points with 95% confidence if (a) he uses a previous estimate of 22% (b) he does not use any prior estimates? (Round up to the nearest integer.) (a) n (b) n Round up to the nearest integer.)

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

A: Given : Margin of error: ME = 0.038 sample proportion: p̂ = 0.135…

Q: How many students should be sampled in order to be 90% confident in estimating the proportion in…

A: Given that  Margin of error =E =0.10 90% confidence.

Q: Suppose that a national poll of 300 registered Republicans was conducted this week and 165 stated…

A: Given that  n=300 , X=165

Q: What sample size should be obtained if he wants to be within 4 percentage points with 95​%…

A: Given that the margin of error is 4 percentage points. That is, ME=4%=0.04 Confidence level =95% The…

Q: A study found that 73% of elementary students buy lunch at school at least once a month. How large a…

A: Given,sample proportion(p^)=0.73margin of error(E)=0.03α=1-0.95=0.05α2=0.025Z0.025=1.96       (from…

Q: what size sample should be obtained if the estimate is to be within 0.01 with a 95% confidence if my…

A: Given,E=0.01p=0.32z-value at 95% confidence is Zc=1.96n=?

Q: A person wants to know if the proportion of the people in Dubai who commutes to work by public…

A: The random variable is proportion of the people in Dubai who commutes to work by public…

Q: Dr. Victory is a child psychologist with an inner-city school district. He wants to estimate the…

A:

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A:

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: Given: A physical therapist wants to determine the difference in the proportion of men and women who…

Q: A nutritionist wants to estimate the difference between the percentage of men and women who have…

A: a. Computing the sample size: The confidence level is 90%. Therefore, α = 0.1,α/2=0.05 and 1-( α/2)…

Q: Suppose you select a simple random sample of 75 Douglas College students, and you find that 8 are…

A: The point estimate of the population proportion is the sample proportion. Given that, 8 out of the…

Q: The Slayer's Cake Bakery wishes to estimate the proportion of its customers who are repeat customers…

A:

Q: . What size sample should be obtained if she wishes the estimate to be within 0.04 with 90​%…

A: here given, p = 0.32 MOE  = 0.04 Z-score for 90% confidence level = 1.645 (  use Excel command…

Q: The state education commission wants to estimate the fraction of tenth grade students that have…

A: From the given information, The population proportion was estimated to be 0.21. Confidence level is…

Q: n July 2018, the Gallup Poll asked a random sample of 1033 American adults, "Has drug abuse ever…

A: Margin of error is the error due to random sampling. Margin of error decreases with increase in…

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: c = 95% E = 2% = 0.02 p^1=0.215p^2=0.195

Q: A researcher wishes to estimate the proportion of adults who have​ high-speed Internet access. What…

A:

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A:

Q: Suppose the U.S. president wants to estimate the proportion of the population that supports his…

A: Critical value: The value of α is 0.05 for 95% confidence level. Using excel formula…

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: Given data: Confidence level = 90% To find: Required sample size

Q: A polling agency wants to determine the percentage of voters in favour of extending tax cuts. they…

A: Given information- Margin of error, E = 2% = 0.02 Confidence level, c = 95% Since nothing is known…

Q: A pollster wishes to estimate, with 99% confidence, the proportion of people who believe that recent…

A: Introduction: The 100 (1 – α) % confidence interval for the population proportion, p is: Here, n is…

Q: A recent study indicated that 24% of women over 55 are widows. A researcher wishes to estimate with…

A:

Q: A pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in…

A:

Q: A researcher wishes to estimate the proportion of households that have broadband internet access.…

A: The following is the formula for calculation of sample size Where n is the required sample size P…

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: Given Information: Confidence level = 90% = 0.90 Margin of Error E=5%=0.05 Sample proportion of…

Q: The state education commission wants to estimate the fraction of tenth grade students that have…

A: The random variable is tenth grade students. It follows standard normal distribution. The population…

Q: A tv sports commenter wants to estimat th proportion of citizens who "follow professional football."…

A:

Q: We are interested in estimating the proportion of employees of a very large corporation who prefer…

A: Solution: From the given information, confidence level is 0.95 and E=0.03.

Q: Suppose we have the results of a Gallup survey (simple random sampling) which asks participants for…

A:

Q: A researcher wishes to estimate the proportion of adults who have high speed internet access. What…

A:

Q: What is the point estimate of the true proportion of people in the population who are over 6 feet…

A: Given that, Sample of 50 peoples is to be drawn and out of which 14 are possessing  characteristic…

Q: Try This 8.3.2 wish to estimate, with 90% confidence, the population proportion of U.S. adults who…

A: Find z-critical value:…

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: Percentage of level of confidence is 95%. Here, margin of error is, E=0.03.

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: Given: Margin of Error ME= 0.06 Confidence level c= 0.90

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: Given: Confidence level = 0.95, margin of error = E = 0.08.

Q: Suppose we want to know what proportion p of students in a large university have studied calculus in…

A: Given,E=0.03z value at 95% confidence is Zc=1.96let the proportion be p=0.5n=?

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

A:

Q: In a random sample of 500 teenagers 12 to 17 years old, it was found that 330 have regular access to…

A:

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: From the given information, Margin error (E) = 0.03 Assume sample proportion = 0.5   The objective…

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

A: The formula for the sample size is as follows: Here, zα/2 is the critical value at 94% confidence…

Q: researcher wishes to estimate the true proportion of all speeders who exceed the posted speed limit…

A: Since the estimate of population proportion is not given so we can assume it to be 0.5.    The…

Q: At a certain college, it is estimated that fewer than 25% of the students have cars on campus. Does…

A: Given that,  H0: p= 0.25  H1: p=! 0.25 Sample size is n= 90 And x= 28 Proportion, P= x/n  = 28/90…

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 0.95 and E=0.025.

Q: The Department of Health and Human Services has been asked to estimate the proportion of "latch-key"…

A:

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A:

Q: A congressperson wants to estimate the proportion of people in her district that think she is doing…

A: