A recent study indicated that 20% of 133 women over age 55 in the study were widows.  a. How large a sample must you take to be 95% confident that the estimate is within 0.05 of the true proportion of women over age 55 who are widows?  b. If no estimate of the proportion is available, how large should the sample be?

Q: A federal report indicated that 22% of children ages 2 to 5 years had a good diet, an increase over…

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Q: 2. Given: n=80, a = 15, level of confidence is 92%. What is the margin of error of the given data?

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

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

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Q: A recent poll of 800 people who work indoors found that 208 of them smoke. If the researchers wnat…

A: The sample proportion can be calculated as: p=x/n=208/800=0.26 At a 98% confidence level, the z…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Margin of Error(E)=0.05For 99% confidence level Zα2=2.576 Formula; E=Zα2×(p×(1-p)n)

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

A: It is given that margin of error (E) is 0.04 and the confidence level is 99%.

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: It is given that margin of error (E) is 0.04 and the confidence level is 99%.Here,

Q: An apple, 37% of the people polled answered yes to the question "are you in favor of the death…

A: The provided information is: Sample proportionsp^=0.37 Margin of errorE=0.03 Level of…

Q: You are told that your IQ scores falls at the 79th percentile.  What conclusion could you make about…

A: Percentiles: If the elements in the data set are arranged in ascending order of magnitude, then the…

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

A: Given Information: Error (e) = 0.02 Confidence level = 90%  The z score at 90% confidence level is…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: From the provided information, Margin of error (E) = 0.04 Confidence level = 90%

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

A:

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

A: (a) Given that, Critical values: Using the z-table, the critical value at 95% confidence level is…

Q: In a​ poll, 6969​% of the people polled answered yes to the question​ "Are you in favor of the death…

A: Obtain the value of the minimum number of surveyed people. The value of the minimum number of…

Q: In a​ poll, 69​% of the people polled answered yes to the question​ "Are you in favor of the death…

A: From the given question,69% of the people polled answered yes to the question.That means,…

Q: Use the information below to answer Questions #23 and # 24. A researcher wishes to estimate, with…

A: Given that, A researcher wants to estimate with 95% confidence E = 4% = 0.04

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: a) Given,   Margin error = 0.02 Population proportion = 0.36   The objective is to find the sample…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: GivenMargin of error(E)=0.03confidence level(c)=99%α=1-0.99=0.01α2=0.05zα2=z0.05=1.6449   (from…

Q: A researcher wishes to estimate the proportion of corporate executives whose annual salary is over…

A:

Q: At the Fredericton High School it is estimated that at most 25% of the students ride bikes to…

A: Let, p = proportion of students who ride bikes to school

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

A: The random variable is adults who have​ high-speed Internet access. It follows standard normal…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny . What…

A: A) Sample size obtained when he uses a previous estimate of 32%. As given he wishes the estimate to…

Q: When estimating the true proportion, how large a sample is needed to be 95% confident that the error…

A: It is given that Margin of error E = 0.06 Level of confidence = 0.95 The critical value of Z at 95%…

Q: A researcher wishes to be 95% confidence that her estimate of the true proportion of individuals who…

A: Given that  Confidence level (C) = 95%  The true proportion of individuals who travel overseas is…

Q: When estimating the proportion of Ole Miss students that support moving the Confederate statue, how…

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Q: You are told that the proportion p of those who answered "yes" to a poll about internet use is 'p =…

A:

Q: wishes the estimate to be within 0.04 with 95% confidence if (a) she uses a previous estimate of…

A: We have to find what size sample should be obtained if she wishes the estimate to be within 0.04…

Q: A researcher wishes to estimate the proportion of adult males who are less than 5 feet 5 inches…

A: It is given that margin of error (E) is 0.04 and the confidence level is 0.90.

Q: A group of students need to submit a project and they need to survey people about their daily…

A: see the handwritten solution

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

A: It is given that there is 95% confidence.

Q: In what range would you expect to find the middle 98% of most head breadths? Between and If you were…

A: Let x1 and x2 be the head breadths. The middle 98% of most head breadths lies between is,…

Q: For a sample of 12 offenders convicted of weapons violations, the length of prison sentence in…

A: to find mean valuemean = sum of observations/ count of observationsmean = (6 + 6 + 2 + 12 + 36 + 48…

Q: b. He would like the sample mean to be within 1 square inch of the population mean, with probability…

A: Here use normal distribution

Q: 1. What percentage of scores fell within ±1 SD for ZADHD?

A: By using Empirical rule, we can know that what percentage of data fall with in the number of…

Q: In a study with lower quartile 100, upper quartile 140 and median as 130 How many people can have…

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

A:

Q: Before working with percentages in confidence intervals and hypothesis tests for p, change them to…

A: Confidence or testing formula always given in proportion form.

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny What size…

A:

Q: When estimating the population proportion, how large a sample is needed to be 95% confident that the…

A: Here  sample proportion = 42/120= 0.35

Q: what sample size should a researcher take if he wants to estimate a population proportion to be 2%…

A: From the given information,   Margin error = 0.02 Assume sample proportion = 0.5   Critical value:…

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

A: Given information:Margin of error (E) = 0.04Confidence level=90%…

Q: Given a population of 5000 scores with mean µ = 86 and o= 10. How many scores 3. above 116?

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Q: You would like to be 99.9 confident that your estimate is within 2% of the true population…

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Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny . What…

A:

Q: If a 95% Confidence for the Population Proportion is (0.56, 0.78), fınd its Margin of Error.

A:

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: a) Given that: p= previous estimate = 32% =0.32 e= error= 3%=0.03 z=critical value for confidence…

Q: On a recent Washington to London flight with 300 passengers, it was found that 100 passengers were…

A:

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

A: Given information: Margin of error(E)=0.03. Confidence level= 90%. α=1-0.90  =0.10 Zα2=Z0.102…

Q: Set up the null and alternate hypotheses to test whether the population mean is equal to 10 when you…

A: The Null hypothesis is  Ho: μ=10

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.