Gallup conducted a survey of 1,015 randomly selected U.S. adults about "Black Friday" shopping. They asked the following question:"As you know, the Friday after Thanksgiving is one of the biggest shopping days of the year.Looking ahead, do you personally plan on shopping on the Friday after Thanksgiving, or not?"Of the 515 men who responded, 16% said "Yes." Of the 500 women who responded, 20% said "Yes." The standard error of thedifferences in proportions (Py – Pw) is about SE = 0.025. Use the normal distribution to test, at the 5% level, if the proportions ofmen and women who planned to shop on the Friday after Thanksgiving are significantly different. The sample size is large enough touse the normal distribution.z =1.6p-value =There isevidence that the proportion of men and women who planned to shop the Friday after Thanksgiving are significantlydifferent.

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Answered: Gallup conducted a survey of 1,015…

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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. Historically (from about 2001 to 2005), about 58% of Americans believed that Earth’s temperature was rising (“global warming”). A March 2010 Gallup Poll sought to determine whether this proportion had changed. The poll interviewed 1014 adult Americans, and 527 said they believed that global warming was real. (Assume these 1014 adults represented a simple random sample.) (a) What percentage in the sample believed global warming was real in 2010? Is this more or less than the historical 58%? (b) Test the hypothesis that the proportion of Americans who believe global warming is real has changed. Use a significance level of 0.05. (c) Choose the correct interpretation: In 2010, the percentage of Americans who believe global warming is real is not significantly different from 58%. In 2010, the percentage of Americans who believe global warming is real has changed from the historical level of 58%.
A. Thinking out of the Box: Sampling Methods Outside the box: Write your thoughts and ideas using different real life samples to support your answer Inside the box. Write your thoughts and ideas of the guide question in the box using the different concepts you have search in the internet. CHECKIMG LO THINKING OUTSIDE THE BOX eine to noit eiea IN THE BOX tevi I think... reh alend s es moteocogiuIG noloale IsGtsnonocorto ene obiwnOUBA Bne vspheied OUT OF THE BOX 003心 bo I think. soupin
College Degree Recipients A survey of 800 recent degree recipients found that 158 received associate degrees; 451, bachelor degrees, 21 first-professional degrees; 154, master degrees; and 16, doctorates. Is there sufficient evidence to conclude that at least one of the proportions differs from a report which stated that 23.3% were associate degrees; 51.1%, bachelor degrees; 3%, first professional degrees; 20.6%, master degrees; and 2%, doctorates? Use =α0.10.
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By a small margin, Facebook remains the top choice of social media over all ages, with 29% using Facebook most often among those using social media sites. However, more visually oriented social networks such as Snapchat and Instagram continue to draw in younger audiences. When asked "Which one social networking brand do you use most often?" the results in the table show the top brands chosen by Americans aged 12-34 who currently use any social networking site or service. Social M edia Site Faceboo k Snapchat Instagra m Twitter Percentage That Use Most Often 29 28 26 6 20 (a) What is the sum of the percentages for these top social media sites? Give your answer as an exact number. Macmillan Learning top social media sites: What percent of Americans aged 12-34 use other social media sites most often? Give your answer as an exact number. other social media sites: do %
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16. The Higher Education Research Institute at UCLA collected data from 203,967 incoming first-time, full-time freshmen from 270 four-year colleges and universities in the U.S. 71.6% of those students replied that, yes, they believe that same-sex couples should have the right to legal marital status. Suppose that you randomly pick twelve first-time, full-time freshmen from the survey. You are interested in the number that believes that same-sex couples should have the right to legal marital status.What is the standard deviation (?)? (Round your answer to four decimal places.)? = ___________
A teacher announces a pop quiz for which the student is completely unprepared. The quiz consists of 20 true-false questions. The student has no choice but to guess the answer randomly for all 20 questions. The accompanying table gives the 20 correct answers, which were actually randomly generated. Complete parts a. and b. below. a. How many questions can the student expect to answer correctly simply by guessing? b. What percentage of answers were true, and what percentage would you expect? Why are they not necessarily identical? The percentage of answers that were true was? The expected percentage of answers that would be true is? Why are these answers not necessarily identical? A. With random phenomena, the proportion of times that something happens is highly predictable in the short run. B. With random phenomena, the proportion of times that something happens is highly random and variable in the short run. C. With random phenomena, the…

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