(a) The organizers of a conference want to survey attendees about the registration fee. Which of the following best describes a cluster sample ofattendees?The organizers select the first 90 attendees who register for the conference because these attendees are easily accessible.The organizers form groups of 30 attendees based on the day the attendees registered. Then, the organizers randomly choose 3 groups andselect all of the attendees in these groups.The organizers take a list of the attendees and select every 5" attendee until 90 attendees are selected.(b) Counselors at a college want to poll students about how much time the students spend studying. Which of the following best describes a stratifiedsample of students?The counselors form 6 groups of students based on the numbers of classes the students are taking. Then, the counselors select 13 students atrandom from each group.The students living in a particular dorm building on campus are easily accessible. So, the counselors select the 78 students living in thatparticular dorm building.The counselors form groups of 13 students based on the students' majors. Then, the counselors select all of the students in 6 randomly chosengroups.(c) A facilities supervisor at a sports stadium wants to rate the condition of the seats at the stadium. Which of the following best describes a systematicsample of seats?The supervisor uses a computer program to draw 50 seats at random and selects these seats. Every set of 50 seats is equally likely to be drawnby the computer program.The supervisor forms 2 groups of seats based on the dates the seats were last replaced. Then, she selects 25 seats at random from each group.thThe supervisor takes a list of the seats and selects every 5" seat until 50 seats are selected.

here use definition of different sampling method

Answered: a) The organizers of a conference want…

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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Researchers asked parents of 19 American children, ages 8 to 12, to complete surveys on the number of hours their children spent reading and the number of hours they spent on screen-based media time. Each of the children also underwent magnetic resonance imaging (MRI) to assess connectivity in the brain. More time spent reading was associated with higher connectivity, while more screen time was associated with lower connectivity in the brains of the children. 1. What is the sample in this study? c 2. What is a possible population? F6 3. Is this an experiment or an observational study? Why did you make that decision? 4. Can we conclude that more time spent reading increases connectivity in children's brains? 5. Identify a possible confounding variable and explain how it meets the definition of a confounding variable. MacBook Air tv♫ F7 * 2 DII F8 ( ZA F9 1 F10 & F11 DOCX A
Adela Noriegam, a researcher wants to determine how employee salaries at a certain company are related to the length of employment, previous experience, and education. The researcher selects eight employees from the company and obtains the following data: Employee Salary,y Employment (in yrs), x1 Employment (in yrs), x2 Employment (in yrs), x3 A 57310 10 2 16 B 57380 5 6 16 C 54135 4 1 12 D 56985 6 5 14 E 58715 8 8 16 F 60000 20 0 12 G 59400 9 4 18 H 60720 15 7 17 What is the regression equation? Leave your answer in 2 decimal places Y = ()+() +() +
A sample of 239 adults is selected. The adults are classified according to voter registration status ("registered" or "not registered"). They are also classified according to preferred source of current events information ("television", "newspapers", "radio", or "internet sites"). The results are given in the contingency table below. Television Newspapers Radio Internet sites Registered 46 16 29 36 Not registered 31 20 32 29 What is the relative frequency of adults in the sample who prefer to obtain their information through newspapers? Round your answer to two decimal places.
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1. Suppose we want to sample a neighborhood for a community needs assessment. The neighborhood has 7 subdivisions and 3 of the 7 are to be collected for household sampling. How many different ways can we select these households? ·
The racial/ethnic diversity of post high school students enrolled at MVCC during the fall 2020 semester is given below. Racial/Ethnic Diversity of Post High School Students Race/Ethnicity Percent* American Indian or Alaska Native 0.4% Asian 5.3% Black or African American 9.6% Hispanic or Latino 9.6% Two or more races 2.8% Native Hawaiian or Pacific Islander <0.1% Non-Resident Alien 0.5% Unknown 1.5% White 70.2% (*Percentages may not total 100 due to rounding) What is the race/ethnicity of the majority of students at MVCC? What total percent of students were either Black or African American or Hispanic or Latino? There were 3,444 students enrolled at MVCC at the time of the study. How many (not percent) students were Asian? (The answer must be a whole number.)
The racial/ethnic diversity of post high school students enrolled at MVCC during the fall 2020 semester is given below. Racial/Ethnic Diversity of Post High School Students Race/Ethnicity Percent* American Indian or Alaska Native 0.4% Asian 5.3% Black or African American 9.6% Hispanic or Latino 9.6% Two or more races 2.8% Native Hawaiian or Pacific Islander <0.1% Non-Resident Alien 0.5% Unknown 1.5% White 70.2% (*Percentages may not total 100 due to rounding) Is race/ethnicity a qualitative or quantitative variable Is the data displayed in a frequency or relative frequency distribution?

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a) The organizers of a conference want to survey attendees about the registration fee. Which of the following best describes a cluster sample of attendees?