A survey on 1512 high school seniors who took the SAT and who completed an optional web survey betweenApril 25 and April 30, 2007 shows that 55% of high school seniors are fairly certain that they will participate ina study abroad program in college.a) Is this sample a representative sample from the population of all high school seniors in the US?O No. The sample only represents students who took the SAT, and this was also an online survey, so onlystudents who had internet access could complete it.ONo. The sample is not large enough to be representative.Yes. Each member of the population has an equal probability to be selected.Yes. The sample was obtained through randomization.b) Let's assume the conditions for inference are met (even if your answer to part A shows otherwise).Construct a 90% confidence interval for the proportion of high school seniors (of those who took the SAT) whoare fairly certain they will participate in a study abroad program in college. Round your answer to 4 decimalplaces.Lower bound:Upper bound:

Answered: A survey on 1512 high school senfors…

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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There are 15,958,866 adults in a region. If a polling organization randomly selects 1235 adults without replacement, are the selections independent or dependent? If the selections are dependent, can they be treated as independent for the purposes of calculations? Are the selections independent or dependent? A. The selections are dependent, because the selection is done without replacement. B. The selections are dependent, because the sample size is not small relative to the population. C. The selections are independent, because the sample size is small relative to the population. D. The selections are independent, because the selection is done without replacement. If the selections are dependent, can they be treated as independent for the purposes of calculations? A. Yes, because the sample size is greater than 5% of the population. B. Yes, because the sample size is less than 5% of the population. C.…
SJS Travel Agency, a nation wide local travel agency, offers special rates on summer period. The owner wants additional information on the ages of those people taking travel tours. A random sample of 50 customers taking travel tours last summer revealed these ages. 18 29 37 42 47 49 53 57 61 67 19 31 38 44 48 50 54 58 62 68 24 34 39 45 48 51 54 58 63 70 27 36 39 46 48 51 55 59 64 74 28 36 40 46 49 52 56 60 66 77 C. Determine the D1, D2, D3, D4 of the frequency distribution and construct the graph.
List and explain Four examples each of probabilistic and non- propabilistic sampling techniques.
We wish to determine whether there is a relationship between the gender of ateenager and their preferred brand of running shoes. A survey of 200teenagers produced the following results: Preferred BrandGender,Nike, Asics ,New Balance and TotalFemale nike24 ascis19 new balance59 total102 Male nike32 asics28 new balance38 total98 Total nike56 asics47 new balance97 total200 Perform an appropriate test at a 5% level of significance to determine whetherthere is a relationship between the gender of teenagers and the preferredbrand of running shoes.
Gallup At its website (www.gallup.com) the Gallup Pollpublishes results of a new survey each day. Scroll downto the end, and you’ll find a statement that includes wordssuch as these: Results are based on telephone interviews with 1,008 na-tional adults, aged 18 and older, conducted January 3–5, 2013. . . . In addition to sampling error, question word-ing and practical difficulties in conducting surveys can introduce error or bias into the findings of public opinionpolls.a) For this survey, identify the population of interest. b) Gallup performs its surveys by phoning numbers gen-erated at random by a computer program. What is the sampling frame?c) What problems, if any, would you be concerned aboutin matching the sampling frame with the population?
A survey of 1088 adults in a country, asking "As you may know, as part of its effort to investigate terrorism, a federal government agency obtained records from larger telephone and Internet companies in order to compile telephone call logs and Internet communications. Based on what you have heard or read about the program, would you say that you approve or disapprove of this government program?" Of those surveyed, 588 said they disapprove. a. Determine and interpret the sample proportion. b. At the 10% significance level, do the data provide sufficient evidence to conclude that a majority (more than 50%) of adults in the country disapprove of this government surveillance program? ..... a. The sample proportion is (Round to two decimal places as needed.) The sample proportion from this study is the proportion of adults in the that of the government surveillance program. b. What are the hypotheses for the one-proportion z-test? Ho: p= Ha:p (Type integers or decimals.) What is the test…
An art authenticator has a history of successfully identifying forgeries. Over her career, she has been asked to evaluate 74 actual forgeries and correctly identified 69 of them. Further, among all the authentic art she has looked at, she has never claimed any to be forgeries. An art dealer is considering purchasing a painting but is worried it is a fake. His experience in the field over the years indicates about 3% of the artwork he comes across is forged. a) If the dealer employs the services of the authenticator, and she indicates the painting is genuine, what is the chance it is actually a forgery? b) Without authentication, the dealer can sell the painting for $20,000. The price would increase to $25,000 if the painting were authenticated as genuine, but obviously it is worthless if it is deemed a forgery. The authenticator charges $2,000 for her services. Do you think it is worth it for the dealer to use the authenticator? Why or why not?
The state Department of Natural Resources is considering lowering the bag limit on Walleyed Pike on Mud Lake and wants to know how such a decrease will affect the number of people fishing on Mud Lake. Which of the following samples is most likely to provide the necessary information?A) A random sample of all fishermen in the stateB) A random sample of people currently living in the county containing Mud LakeC) Interviewing all the fisherman on the lake each Saturday in JulyD) Interviewing all the resort owners on Mud Lake
b) A certain pay television company wishes to estimate the proportion of its customers who would purchase a pay television program guide. To do this, the company manager decides to select a random sample of customers and note the number who would purchase a program guide. Suppose that experience in other areas suggests that about 13% of customers will purchase a program guide. How many customers should the company manager include in his sample if he wishes to estimate the true proportion who will purchase the program guide correct to within 5% (0.05) with a confidence level of 95%?
SIS Travel Agency, a nation wide local travel agency, offers special rates on summer perlod. The owner wants additional information on the ages of those people taking travel tours. A random sample of 50 customers taking travel tours last summer revealed these ages. 18 29 37 42 47 49 53 57 61 67 19 31 38 44 48 50 54 58 62 68 24 34 39 45 48 51 54 58 63 70 27 36 39 46 48 51 55 59 64 74 28 36 40 46 49 52 56 60 66 77 B. Determine the P15, P22, , P55, P77 of the frequency distribution and construct the graph.
Why is it important to ensure that research participants' names and other identifying information are not included in the notes and other researcher data? Select one. O Only certain studies need to keep participant information confidential. O Anonymity protects the research participant from being discriminated against in the event another agency/entity has access to the raw data. O It is not necessary for respondents to remain anonymous in research. O In double blind studies, the participant does not need to remain anonymous.
Due to the popularity of instant messaging and social networking, informal elements such as emoticons (e.g., the symbol “:)” to represent a smile) and abbreviations (e.g., “LOL” for “laughing out loud”) have worked their way into teenagers’ school writing assignments. A Pew Internet and American Life Project (Apr. 2008) survey interviewed 700 randomly selected U.S. teenagers by telephone on their writing habits. Overall, 448 of the teenagers admitted using at least one informal element in school writing assignments. Recall that in a random sample of 700 teenagers, 448 admitted to using at least one informal element in school writing assignments. [Note: Emoticons, such as using the symbol “:)” to represent a smile, and abbreviations, such as writing “LOL” for “laughing out loud,” are considered informal elements.] Is there evidence to indicate that less than 65% of all U.S. teenagers have used at least one informal element in school writing assignments? Test the relevant hypotheses…

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