2A bus company wants to survey the residents of a city about increased fundingfor public transit. The company considers 3 different sampling methods:For each method, describe the sampling technique and suggest any biases.a) Placing advertising on buses asking people to fill out surveys on a web site.Sampling Technique:Biases:b) Interviewing people as they're waiting for a bus.Sampling Technique:Biases:c) Interviewing people randomly selected from a phone book.Sampling Technique:Biases:

Sampling is a process of selecting representative subjects or cases of a population into a sample.

Answered: A bus company wants to su for public…

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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An online university wants to invest in a new tutoring program. Before they make the commitment, the research team wants to know how many students enrolled in the university would actually use the tutoring program. They decided to conduct a survey to find out. The institution has 4,000 undergraduate students. How many students would you survey? How would you choose them? (Be specific in your sampling method description) Adam got the name of all 4,000 students in the university and put their names in a hat. He then drew 300 names. What do you think of Adam’s survey? Explain your answer. Sarah asked all currently enrolled seniors. What do you think of Sarah’s survey? Explain your answer.
Age and party 2008. The Pew Research Centercollected data from national exits polls conducted byNBC News after the 2008 presidential election. Thefollowing table shows information regarding voter ageand party preference: a) What sampling strategy do you think the pollstersused? Explain.b) What percentage of the people surveyed wereDemocrats? c) Do you think this is a good estimate of the percent-age of voters in the United States who are registered Democrats? Why or why not?d) In creating this sample design, what question do youthink the pollsters were trying to answer? Republican Democrat Other Total18–29 260 390 351 100130–44 320 379 300 99945–64 329 369 300 99865+ 361 392 251 1004Total 1270 1530 1202 4002
Acme Bus Company has selected you to conduct a survey of their riders. They want data on 50 minors (younger than 18 years) and 100 adults (18 years or older). You will use quota sampling. a) Define quota sampling b) Justify why quota sampling is used in the survey c) Explain how you would select the sample. d) Explain how you would gather the data.
Identify the sampling techniques used, and discuss potential sources of bias (if any). Explain. After a tsunami, a disaster area is divided into 250 equal grids. Thirty of the grids are selected, and every occupied household in the grid is interviewed to help focus relief efforts on what residents require the most. What type of sampling is used? A. Stratified sampling is used, since the disaster area is divded into grids, and a random sample is taken from each grid. B. Cluster sampling is used, since the disaster area is divded into grids, and a random sample is taken from each grid. C. Stratified sampling is used, since the disaster area is divided into grids, and some of those grids are selected and everyone in those grids is interviewed. D. Cluster sampling is used, since the disaster area is divided into grids, and some of those grids are selected and everyone in those grids is interviewed. What potential sources of bias are present, if any? Select all that apply. A. Certain grids…
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Identify the type of sampling bias guaranteed to occur in each of the sampling schemes, based on the information provided. Some sampling schemes may incur multiple types of bias. You are currently in a labeling module. Turn off browse mode or quick nav, Tab to items, Space or Enter to pick up, Tab to move, Space or Enter to drop. A political poll is conducted by contacting people on landline phones. The pollstersdid not keep track of how many people they contacted who did not respond.A political poll is administered by contacting people on landline phones. The pollsterscontacted 10,00010,000 households, and 23662366 individuals agreed to speak with the caller.A political poll is conducted by setting up a booth at a local shopping mall andinviting passersby to share their opinions.A political poll asks the question, "If you found out that Candidate A did notgraduate from high school, would that change your opinion of how unintelligentCandidate A is?" self‑selectionmulti-use…
As part of a class project a teacher brings a large jar containing 200 gum balls of 2 different colors, white and green to class. A student draws a sample of 20 gum balls, of which 4 are white and 16 are green. The students job is to estimate how many of the gum balls are white. A.) Use the sample to estimate the % of white gum balls in the jar. B.) Give the sampling proportion as a %. C.) If there were 60 white gum balls in the jar, give the parameter of white gum balls in the jar as a %. D.) Give the sampling error as a percent.
For each situation, name the type of bias that may occur in the data collected. Explain your answer. a) A school wants to gather parent opinions on the current cell phone policy at the school. They have sent letters with a survey for the parent to return to the school board office. b) A survey about teaching strategies used in the “Secondary Classes” (7-12th grades) for a school district was handed out to a random sample of teachers from the three high schools in the district.Less than 20% of the surveys were returned. c) A survey with the question “Do you agree that a national system of health insurance should be favored because it would provide health insurance for everyone and reduce administrative costs?”
Determine the sampling method used in the following situation: A political party wants to know the reaction of voters to a debate between the candidates. The day after the debate, the party's polling staff used a statistical software to generate 1,300 phone numbers. The staff called the numbers, and if a registered voter answers the phone, or is available to come to the phone, that registered voter is asked whom they intend to vote for, and whether the debate changed their opinion of the candidates. Simple Random Sampling Systematic Sampling SUBMIT QUESTION SAVE PROGRESS All folders are up to date 70 Connected to: Microsoft Exchange SUBMIT ASSI

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A bus company wants to su for public transit. The comp For each method, describe a) Placing advertising on bus Sampling Technique: Biases: b) Interviewing people as the Sampling Technique: Biases: c) Interviewing people random Sampling Technique: Biases: