Exam 10: Sample Surveys

Which of the following survey questions is leading?

Shortly after the Sandy Hook Elementary School shooting in December 2012, a local Television news program asked viewers to call in with their opinion about gun control.These Results were likely biased because

The main ideas of sampling do not include

Name and describe the kind of bias that might be present if the administration decides that instead of subjecting people to random testing they'll just… a.interview employees about possible drug abuse. b.ask people to volunteer to be tested.

The administration of a large university is interested in learning about the types of wellness Programs that would interest its employees.Suppose that the university randomly selects a School (e.g., the Business School) and surveys all of the individuals (administration, faculty, Professional staff, clerical and maintenance) who work in that school.This sampling plan is Called

Which of these is not an advantage of using a stratified sample instead of a simple random Sample?

Molly's Reach, a regional restaurant and gift shop, has recently launched an increased sales campaign, particularly focused on their gift shop.To determine if their proposal is of interest, they plan to survey a random sample of their regular customers.Suppose that Molly's Reach has an alphabetized list of regular customers who belong to their rewards program.After randomly selecting a customer on the list, every 25th customer from that point on is chosen to be in the samplE.This sampling plan is called

Molly's Reach, a regional restaurant and gift shop, has recently launched an increased salescampaign, particularly focused on their gift shop.To determine if their proposal is of interest,they plan to survey a random sample of their regular customers.Which of the following isthe parameter of interest in the Molly's Reach study?

Listed at the right are the names of twenty full-time clerks on the retail staff.Use the random numbers listed below to select four of them to be in your sample.Clearly explain your method. 18192 95318 02975 01191 2995809275 89141 61909 Larry Marissa Tim Diane Carol Joshua Barbara Allan Rich Sharyn Brian Kelly Nicole John June Frank Steve Andrea Matthew Erin

Explain why the first plan suggested above, sampling an entire classification, might be biased.Be sure to name the kind(s) of bias you describe.

Among a dozen eggs, three are rotten.A cookie recipe calls for two eggs; they'll be selected randomly from that dozen.Which plan could be used to simulate the number of rotten eggs that might be chosen? I.Let 0, 1, and 2 represent the rotten eggs, and 3, 4, …, 11 the good eggs.Generate two random numbers 0-11, ignoring repeats. II.Randomly generate a 0, 1, or 2 to represent the number of rotten eggs you get. III.Since 25% of the eggs are rotten, let 0 = rotten and 1, 2, 3 = good.Generate two random numbers 0-3 and see how may 0's you get.

Hoping to get information that would allow them to negotiate new rates with their advertisers, Natural Health magazine phoned a random sample of 600 subscribers.64% of those polled said they use nutritional supplements.Which is true? I.The population of interest is the people who read this magazine. II."64%" is not a statistic; it's the parameter of interest. III.This sampling design should provide the company with a reasonably accurate estimate of The percentage of all subscribers who use supplements.

The administration of a large university is interested in learning about the types of wellness Programs that would interest its employees.Suppose that there are five categories of Employees (administration, faculty, professional staff, clerical and maintenance) and the University decides to randomly select ten individuals from each category.This sampling plan is called

Molly's Reach, a regional restaurant and gift shop, has recently launched an increased sales campaign, particularly focused on their gift shop.To determine if their proposal is of interest, they plan to survey a random sample of their regular customers.Suppose that Molly's Reach's regular customers belong to a rewards program and have a customer rewards ID number.Molly's Reach decides to randomly select 100 numbers.This sampling plan is called

A statistics teacher wants to know how her students feel about an introductory statistics course.She decides to administer a survey to a random sample of students taking the course.She has several sampling plans to choose from.Name the sampling strategy in each. A.There are four ranks of students taking the class: freshmen, sophomores, juniors, and seniors.Randomly select 15 students from each class rank. B.Randomly select a class rank (freshmen, sophomores, juniors, and seniors) and survey every student in that class rank. C.Each student has a nine-digit student number.Randomly choose 60 numbers. D.Using the class roster, select every fifth student from the list.

Molly's Reach, a regional restaurant and gift shop, has recently launched an increased sales campaign, particularly focused on their gift shop.To determine if their proposal is of interest, they plan to survey a random sample of their regular customers.All regular Molly's Reach customers is known as the ________ of the study.

Listed at the right are the names of the 20 pharmacists on the hospital staff.Use the random numbers listed below to select three of them to be in the sample.Clearly explain your method. 04905 83852 29350 91397 $19994 \quad 6514205087 \quad 11232$ Pastore Back Spiridinov Ahl Hedge MacDowell Schissel Novelli Lavine Kaplan Highland Roundy Grubb Markowitz Glass Davies Golkowski Reeves Janis Yen

The principal of a small elementary school wants to select a simple random sample of 24students.The school has 12 classrooms with 18 students in each class.She decides torandomly select two students from each classroom.Is this a simple random sample?

Administrators at a hospital are concerned about the possibility of drug abuse by people who work there.They decide to check on the extent of the problem by having a random sample of the employees undergo a drug test. a.Define the population and the parameter of interest in context. b.Describe a method that you would use to collect your sample.Make sure to name the sampling strategy chose. c.There are four employee classifications: doctors, medical staff (nurses, technicians, etc.) office staff, and support staff (custodians, maintenance, etc.).Describe how knowing about these classifications would modify your plan in part (a) and why.

Explain why the second plan suggested above, sampling all students from one class rank,might be biased.Be sure to name the kind(s) of bias youdescribe.