4. Which sampling method was utilized? Why?(a) Student organization looking to get signatures for a petition camp out in front of Class of 128Computer room(b) Select three students from a class to receive ice cream by putting all the students' names in a hat andpicking out three names randomly.(c) Select three female students and three male students to receive ice cream by putting all the men'snames in one hat and all the women's names in a different hat and picking out three names from each1hat.(d) In Summer 2018, the ABC in Australia requested viewers to call the network and indicate theirfavorite poem.(e) Divide the class into four groups (freshman, sophomore, junior and senior) and take a randomsample of two students from each group.(f) Priceline.com randomly e-mails a Customer Satisfaction Survey for certain transactions done on itssite in which customers choose to either respond or not.5. A medical researcher wants to determine whether exercising can lower blood pressure. At a healthfair, he measures the blood pressure of 100 individuals, and interviews them about their exercisehabits. He divides the individuals into two categories: those whose typical level of exercise is low,and those whose level of exercise is high.a. Is this a controlled experiment or an observational study?b. The subjects in the low exercise group had considerably higher blood pressure, on theaverage, than subjects in the high exercise group. The researcher concludes that exercisedecreases blood pressure. Is this conclusion well-justified? Explain.

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Answered: 4. Which sampling method was utilized?…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

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The principal at Tahoe Elementary School randomly selected three of the school's twelve classes of students to participate in an option poll. All of the children in each of the three randomly selected classes were asked the question, "What is your favorite fruit to eat?". The following results were obtained. Apples, Grapes, Apple, Apple, Banana, Apple, Apple, Grapes, Orange, Apple, Apple, Banana, Strawberries, Apple, Apple, Grapes, Apple, Orange, Apple, Apple, Apple, Apple, Grapes, Grapes, Apple, Orange, Apple, Apple, Banana, Apple, Apple, Apple, Strawberries, Apple, Orange, Grapes, Grapes, Apple, Grapes, Grapes, Grapes, Banana, Grapes, Banana, Apple, Banana, Grapes, Apple, Banana, Strawberries, Banana, Apple, Orange, Grapes, Orange, Grapes, Apple, Orange. Use the results of this opinion poll to estimate, with 95% confidence, the actual percentage of children attending Tahoe Elementary School whose favorite fruit to eat is Grapes. Express the estimate both symbolically and verbally.
The table below shows the results of a survey that asked 1044 adults from a certain country if they favored or opposed a tax to fund education. A person is selected at random. Complete parts (a) through (c). Support Oppose Unsure Total Males 151 319 13 483 Females 237 305 19 561 Total 388 624 32 1044
1 The Blue Tide High School Student Committee has 5 members. They would like to conduct a survey to get the students’ opinion on the school’s new bell schedule. They asked 23 students’ representatives to distribute a questionnaire to the schools’ 1550 students. In the end, they received 750 responses. They wrote a report based on the information provided by the respondents. 2) which number represents the size of the sample?
Find the answer to each of the following counting problems: • The U.S. Senate Appropriations Committee has 29 members and a subcommittee is to be formed by randomly selecting 5 of its members. How many different committees could be formed? • If 25 people start a race, in how many different ways can the top 2 finishers be determined? • Companies who stocks are listed on the NASDAQ stock exchange have their company name represented by either four or five letters (repetition of letters is allowed). What is the maximum number of companies that can be listed on the NASDAQ?
A lecturer wishes to study the examination results of students from the Faculty of Computer Science which consists of 30 classes. He intends to choose only eight classes and all the students from these eight classes will be selected (a) State the population for this study. (b) State the variable and its type for this study. (c) State the sampling technique used for this sta
A company has both male and female employees. The company has shirts and jackets with the company logo to give away to employees. For each of the company's 221 employees, a manager asked which piece of clothing the employee prefers. The preferences, based on gender, are summarized in the table below. Shirt Jacket Male 97 16 Female 84 24 Suppose an employee of the company is chosen at random. Answer each part. Do not round intermediate computations, and round your answers to the nearest hundredth. (If necessary, consult a list of formulas.) (a) What is the probability that the employee is female and prefers a shirt? (b) What is the probability that the employee is female or prefers a shirt?
Five state officials are listed to the right. Lieutenant Governor (L) Secretary of State (S) Attorney General (A) Representative (R) Press Secretary (P) a. List the 10 possible samples (without replacement) of size 3 that can be obtained from the population of five officials. b. If a simple random sampling procedure is used to obtain a sample of three officials, what are the chances that it is the first sample on your list in part (a)? the second sample? the tenth sample? a. List all 10 possible samples (without replacement) of size 3. Use the letter abbreviation for each official. (Use a comma to separate answers as needed.) b. What is the chance that the first sample in your list is selected? Type an exact answer.) What is the chance that the second sample in your list is selected? Type an exact answer.) What is the chance that the tenth sample in your list is selected? (1)
A company is selecting 6 people to be on a committee. There are 26 employees eligible to be on the committee. What is the total number of ways the committee may be formed if the employees are selected at random?
A new restaurant has been open for three months and wants feedback from its customers. They plan to give a survey to every 5th customer. Census or Sampling method: Answer Collection method: Answer A dog food claims to make dogs coats shiner and healthier looking. A researcher wants to test the claims. They plan to randomly select pet store shoppers to participate and assign them to two groups. Census or Sampling method: Answer Collection method: Answer The Department of Homeland Security wants to test a computer virus that it has developed to combat hackers. They plan to test run the virus on randomly selected computers with pre-set "hacker" programs. Census or Sampling method: Answer Collection method: Answer
A state official wants to know which party the voters in his state feel is best qualified to lead the country over the next 10 years. He mails a questionnaire on this subject to an SRS of 1600 voters in his state. His staff reports that 325 questionnaires have been returned, of these 241 respondents feel the Democratic Party is best qualified to lead the country over the next 10 years. Question: Please tell us: a) Population b) Sample

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