A researcher 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 90​% confidence if ​(a) he uses a previous estimate of 25​%? ​(b) he does not use any prior​ estimates? a)n= b)n=

Q: A random sample of medical files is used to estimate the proportion p of all people who have blood…

A: we have to find sample size required for margin of error.

Q: A: What is the minimum number of counts required to obtain a count rate of 5% or less precision? B:…

A: As per guidelines we will solve only one question, please post other questions for more answers. B)…

Q: In a survey on supernatural experiences, 724 of 4,003 adult Americans surveyed reported that they…

A: Given Information:  Sample size (n) = 4003  Proportion (p) = 724/4003 = 0.1808

Q: A recent study indicated that 20% of 133 women over age 55 in the study were widows.  a. How large a…

A:

Q: satisfied with their work. Estimate the difference between the proportion of all elementary school…

A: Given Data n1 = 395 x1 = 224 n2 = 264 x2 = 128

Q: A random sample of medical files is used to estimate the proportionp of all people who have blood…

A: a) There is no preliminary estimate for p. Let us consider, p=0.5 Given margin of error, E=0.05…

Q: How many samples are best when dealing with t-test? a. cannot be determined b. exactly 30 c.…

A: We have given that,  How many samples are best when dealing with t-test? Then,  We will find the…

Q: A ponderosa pine forest in Colorado has a pine beetle infestation.  The beetles bore into a tree and…

A: Solution: 1. From the given information, confidence level is 0.90 and E=0.06.

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A:

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: a.Given no preliminary sample is taken to estimate proportion of small businesses that declared…

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: Solution: a. From the given information, confidence level is 0.99 and E=0.08. Since the proportion…

Q: An item is to be constructed by laying three components in a row. The length of eachcomponent will…

A: a) Let the measured length of three components be denoted by X, Y and Z. The combined length of the…

Q: a researcher wants to estimate a population proportion with a margin of error of 0.05. What is the…

A: Given that the margin of error is 0.05. Given confidence level is 95% Significance level is 5% From…

Q: Linda Silbers is a social scientist studying voter opinion about a city bond proposal for a…

A:

Q: The police tested 550 people, to see if anyone would match the partial fingerprint at the crime…

A:

Q: PLEASE JUST ANSWER #3 and the correspdonding right under it   How many females are in your sample?…

A:

Q: The brand manager for a brand of toothpaste must plan a campaign designed to increase brand…

A: Given information- Margin of error, E = 7% = 0.07 Confidence level, c = 80% Since nothing is known…

Q: Recent studies have shown that about 20% of American adults fit the medical definition of being…

A: (a) The population proportion of obese patients in the medical clinic is, P=0.20 (b)  The proportion…

Q: Recent studies have shown that about 23% of American adults fit the medical definition of being…

A: Given: p = 0.23 n = 400

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: Given Information :  The National Council of Small Businesses is interested in the proportion of…

Q: Suppose that you randomly selected 21 adults. Assume 19% of the population smoke. Round all answers…

A: The thumb rule for range is a method for estimating the range from the standard…

Q: The area of a round tabletop is computed from a measurement of its radius. If the fractional…

A: # given fractional uncertainty in radius of a circle =5%  Then to find fractional uncertainty in…

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: Given no primilinary sample is taken to estimate proportion of small businesses that declared…

Q: The National Council of Small Businesses is interested in the proportion of small businesses that…

A: a) It is given that margin of error (E) is 0.11 and the confidence level is 95%.

Q: The results of a recent poll on the preference of teenagers regarding the types of music they listen…

A: Here is given that, two populations and two selected samples. We will use two proportion point…

Q: Covering the worst-case scenario, how many donors must we examine in order to be 95% confident that…

A: During a blood-donor program conducted during finals week for college students, a blood-pressure…

Q: researcher wishes to estimate the proportion of drivers who use their mobile phone while driving. A…

A: Given data: Proportion of drivers = 0.38 Sample size(n)= 28 To find: The standard error of the…

Q: 1. What proportion of your sample is less than 0.4 seconds? 2. Estimate the proportion of all…

A: The sample of 20 reaction times is as follows: 0.28, 0.30, 0.34, 0.36, 0.52,0.36, 0.52, 0.40, 0.51,…

Q: When developing an interval estimate for the difference between two sample means, with sample sizes…

A: When developing an interval estimate for the difference between two sample means, with sample sizes…

Q: A samplê proportion of 0.43 is found. To determine the margin of error for this statistic, a…

A: Margin of error (E) = Width / 2

Q: Travel to Outer Space A CBS News/New York Times poll found that 329 out of 763 randomly selected…

A:

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A:

Q: You want to obtain a sample to estimate a populat proportion. Based on previous evidence, you belie…

A: We have given that,  Population proportion (p) = 68% = 0.68, margin of error (E) = 0.05 and…

Q: By how many times does the sample size have to be increased to decrease the margin of error by a…

A:

Q: ] In a sociological survey, a 1-in-50 systematic sample is drawn from city tax records to determine…

A:

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: From the provided information, Margin of error (E) = 0.11 Confidence level = 95%

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

A: Solution

Q: A researcher wishes to​ estimate, with 95​% ​confidence, the population proportion of adults who eat…

A: It is provided that the estimate must be accurate within 4%. So, the margin of error (E) is 4%. If…

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

A:

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: It is given that confidence level is 0.98, and margin of error E is 0.10.

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

A: It is given that margin of error (E) is 0.03 and the confidence level is 95%.

Q: The point estimate for p, p, is . (Round to three decimal places as needed.) The point estimate for…

A: total population = 4445 2735 think main stream media is more interested in making money than telling…

Q: The use of the Internet is constantly growing. How many randomly selected adults must be surveyed to…

A:

Q: Thirteen different video games showing drug use were observed. The duration times of drug use ​(in…

A: Given n=13

Q: The proportion of color blind individuals in a population needs to be estimated by the percentage…

A: Critical value: Using Excel formula “=NORM.S.INV(1-(0.05/2))”, the critical value at 99% confidence…

Q: According to an independent research, a point estimate of the proportion of U.S.consumers of black…

A:

Q: We will obtain a sample of quarters and weigh them to determine the mean. How many quarters must we…

A: Sample size: sample size is nothing but part of the population. The following is the formula for…

Q: A survey of 2314 adults in a certain large country aged 18 and older conducted by a reputable…

A:

Q: Suppose that we want to estimate what proportion of gift items purchased at a department store are…

A: Given ME= 0.05 Confidence level=95℅

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

A: GivenMargin of error(E)=0.04confidence level=90%

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.