A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.02 with 90% confidence if(a) she uses a previous estimate of 0.56?(b) she does not use any prior estimates?Click the icon to view the table of critical values......(a) n= (Round up to the nearest integer.)(b) n =E (Round up to the nearest integer.)Table of critical valuesLevel of Confidence,Area in Each Tail,Critical Value, ze(1 – a) · 100%90%0.051.64595%0.0251.9699%0.0052.575PrintDoneMacBook ProDIIDD000000F10F7F8F9escF4F5F6F1F2F3

Answered: Image /qna-images/answer/6975b5d5-cefa-47f7-8f7a-0fc94deda02e.jpg

Answered: A researcher 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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A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.04 with 90% confidence if (a) she uses a previous estimate of 0.32? (b) she does not use any prior estimates? Click the icon to view the table of critical values. (a) n=(Round up to the nearest integer.) (b) n= (Round up to the nearest integer.)
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 90% confidence if (a) she uses a previous estimate of 0.52? (b) she does not use any prior estimates? Click the icon to view the table of critical values. Table of critical values (a) n= (Round up to the nearest integer.) (b) n = (Round up to the nearest integer.) Critical Value, Zę Level of Confidence, (1 - a)· 100% Area in Each Tail, 90% 0.05 1.645 95% 0.025 1.96 99% 0,005 2.575 Print Done
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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 1000 supermarket shoppers revealed that 272 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. (Round your answer to four decimal places.)(b) Find a 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 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 55 percentage points with 90% confidence if (a) he uses a previous estimate of 28%? n=what (b) he does not use any prior estimates? n=what
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.02 with 99% confidence if (a) she uses a previous estimate of 0.46? (b) she does not use any prior estimates? Click the icon to view the table of critical values. (a) n = (b) n = (Round up to the nearest integer.) (Round up to the nearest integer.) BE
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 99% confidence if(a) she uses a previous estimate of 0.48? (b) she does not use any prior estimates? n= (Round up to the nearest integer.)
On average, a sample of n = 36 scores will provide a better estimate of the population mean than a sample of n = 49 scores from the same population.
Q1. A psychologist conducted a study on the relationship between introversion and shyness. The values are results for scales of introversion and shyness. High positive scores on each scale indicate high introversion or shyness; and high negative scores indicate low introversion or shyness. Data collected from 10 people as follows: Introversion 4 -7 -1 0 6 7 -4 -9 -5 8 Shyness 11 -7 -1 -3 0 7 -1 -8 -1 5 a) Compute the correlation coefficient relating introversion and shyness scores. b) Find the regression equation which predicts introversion from shyness. c) What introversion score would you predict from a shyness score of 7?
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.05 with 90% confidence if (a) she uses a previous estimate of 0.38? (b) she does not use any prior estimates? Click the icon to view the table of critical values. (a) n = (Round up to the nearest integer.)

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