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 percentagepoints 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) nRound up to the nearest integer.)

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

Answered: Aresearcher wishes to estimate the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The state education commission wants to estimate the proportion of tenth-grade students in the state who read at or below the eight-grade level. The commissioner wants an estimate with a 90% level of confidence and an error of at most 5%? Step 1 of 2 : Assuming the commissioner has no prior knowledge about the proportion, how large of a sample would be required for the commissioner to make the desired estimate? Round your answer up to the next integer.
For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding.In a survey of 1000 large corporations, 246 said that, given a choice between a job candidate who smokes and an equally qualified nonsmoker, the nonsmoker would get the job. (a) Let p represent the proportion of all corporations preferring a nonsmoking candidate. Find a point estimate for p. (Round your answer to four decimal places.)(b) Find a 0.95 confidence interval for p. (Round your answers to three decimal places.) lower limit upper limit What is the margin of error based on a 95% confidence interval? (Round your answer to three decimal places.)
A researcher wants to determine the percentage of American teenagers who send or receive text messages while doing homework. Which of the following techniques would likely be the MOST efficient way of obtaining an accurate estimate for this percentage? 1. Randomly select teenagers from the list of all teenage students in every state in America and mail surveys to those teens, asking them if they send or receive text messages while doing homework. 2. Send a survey to every teenager in America and ask them if they send or receive text messages while doing homework. 3. Randomly select teenagers from the list of all teenage students in one state and mail surveys to those teens, asking them if they send or receive text messages while doing homework.
Suppose "Naturally Gassy" magazine claims that 35% A hypothesis test is to be performed to determine if the natural gas is higher than the magazine's claim. A surve natural gas.
. A polling agency wants to estimate the percentage of voters in favor of repealing and replacing the Affordable Care Act, and it wants to provide a margin of error of no more than 1.8 percentage points with 99% confidence. Which of the following should be used to determine the number of respondents (n) the agency must poll? (A) It cannot be determined from the given information. (0.5)(0.5) n (0.5)(0.5) <0.018 (B) 1.96 (C) 2.576 <0.018 n (0.5)(0.5) (D) 2.576 <0.036 n (E) 2.576, (0.99 (0.01) 11 <0.018
What percentage of your campus student body is female? Let p be the proportion of women students on your campus.
For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding.In a marketing survey, a random sample of 992 supermarket shoppers revealed that 274 always stock up on an item when they find that item at a real bargain price. (a) Let p represent the proportion of all supermarket shoppers who always stock up on an item when they find a real bargain. Find a point estimate for p. (Enter a number. Round your answer to four decimal places.) (b) Find a 95% confidence interval for p. (For each answer, enter a number. Round your answers to three decimal places.)lower limit upper limit Give a brief explanation of the meaning of the interval. We are 95% confident that the true proportion of shoppers who stock up on bargains falls within this interval.We are 5% confident that the true proportion of shoppers who stock up on bargains falls above this interval. We are 5% confident that the true proportion of shoppers who…
Suppose that we want to estimate what proportion of gift items purchased at a department store are returned for a refund, and that we want to be "at least 95% sure" that the error of our estimate will be less than 0.05. How large a sample will we need if a. we have no idea what the true proportion might be? b. we know that the true proportion is between 0.01 and 0.20?
A recent study indicated that 24% of the 137 women over age 55 in the study were widows. Round up your answers to the next whole number for the following questions. How large a sample must you take to be 99% confident that the estimate is within 0.05 of the true proportion of women over age 55 who are widows? If no estimate of the sample proportion is available, how large should the sample be?
A recent study indicated that 24% of the 150 women over age 55 in the study were widows. Round up your answers to the next whole number for the following questions. How large a sample must you take to be 90% confident that the estimate is within 0.02 of the true proportion of women over age 55 who are widows?
Not all visitors to a certain company's website are customers or potential customers. In fact, the company's executives estimate that about 12% of all visitors to the website are looking for other websites. Assume that this estimate is correct and that a random sample of 40 visitors to the website is taken. Answer the following. (If necessary, consult a list of formulas.) (a) Estimate the number of visitors in the sample who actually are looking for the company's website by giving the mean of the relevant distribution (that is, the expectation of the relevant random variable). Do not round your response. (b) Quantify the uncertainty of your estimate by giving the standard deviation of the distribution. Round your response to at least three decimal places.

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