Deck 10: Sample Surveys

Question 1

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.
$\begin{array}{llll}04905 & 83852 & 29350 & 91397\end{array}$
$19994 \quad 6514205087 \quad 11232$


$\begin{array}{|c|c|}\hline \text { Pastore } & \text { Back } \\\hline \text { Spiridinov } & \text { Ahl } \\\hline \text { Hedge } & \text { MacDowell } \\\hline \text { Schissel } & \text { Novelli } \\\hline \text { Lavine } & \text { Kaplan } \\\hline \text { Highland } & \text { Roundy } \\\hline \text { Grubb } & \text { Markowitz } \\\hline \text { Glass } & \text { Davies } \\\hline \text { Golkowski } & \text { Reeves } \\\hline \text { Janis } & \text { Yen } \\\hline\end{array}$

Answer 1

$04905 \quad 83852 \quad 29350\quad 91397$
$\begin{array} { l l l l } 19994 & 65142 & 05087 & 11232 \end{array}$


$\begin{array}{|l|l|}\hline \text { 01 Pastore } & 11 \text { Back } \\\hline \text { 02 Spiridinov } & 12 \text { Ahl } \\\hline \text { 03 Hedge } & 13 \text { MacDowell } \\\hline \text { 04 Schissel } & 14 \text { Novelli } \\\hline \text { 05 Lavine } & 15 \text { Kaplan } \\\hline 06 \text { Highland } & 16 \text { Roundy } \\\hline 07 \text { Grubb } & 17 \text { Markowitz } \\\hline \text { 08 Glass } & 18 \text { Davies } \\\hline \text { 09 Golkowski } & 19 \text { Reeves } \\\hline \text { 10 Janis } & 20 \text { Yen } \\\hline\end{array}$


Number the people $01-20$ (by columns). Go across the random digits two at a time, ignoring 20-99 and any repeats, until three are chosen: 04 - Schissel, (ignore $90,58,38$ , etc), 09 - Golkowski, 13 - MacDowell

Question 2

A basketball player has a 70% free throw percentage.Which plan could be used to simulate The number of free throws she will make in her next five free throw attempts?
I.Let 0,1 represent making the first shot, 2, 3 represent making the second shot,…, 8, 9
Represent making the fifth shot.Generate five random numbers 0-9, ignoring repeats.
II.Let 0, 1, 2 represent missing a shot and 3, 4,…, 9 represent making a shot.Generate five
Random numbers 0-9 and count how many numbers are in 3-9.
III.Let 0, 1, 2 represent missing a shot and 3, 4,…, 9 represent making a shot.Generate five
Random numbers 0-9 and count how many numbers are in 3-9, ignoring repeats.

A)I only
B)II only
C)III only
D)II and III
E)I, II, and III

Answer 2

II only

Question 3

A school district administrator sent a survey to all teachers in the district.Only 30% of the Teachers responded to the survey.Which of the following is true?
I.The people that did not responded are likely to be similar to those that did so he should use them as the sample.
II.This survey design suffered from non-response bias.
III.Because he sent the survey to everyone, this is a census and the results can be applied to
The whole population.

A)I only
B)II only
C)I and II only
D)II and III only
E)I, II, and III

Answer 3

II only

Question 4

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

A)Simple Random Sampling
B)Stratified Sampling
C)Cluster Sampling
D)Systematic Sampling
E)Convenience Sampling

Question 5

A consumer research group is interested in how older drivers view hybrid cars.Specifically, They wish to assess the percentage of drivers in the U.S.50 years of age or older who intend To purchase a hybrid in the next two years.They selected a systematic sample from a list of
AARP (American Association of Retired Persons) members.Based on this sample, they Estimated the percentage to be 17%.The sampling frame for this study is

A)all drivers in the U.S.50 years of age or older
B)17%
C)the list of AARP members
D)how older drivers view hybrid cars
E)none of the above

Question 6

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.

Question 7

The main ideas of sampling do not include

A)Sample size matters
B)Examine a part of the whole
C)The fraction of the larger population determines the precision of the resulting statistics
D)Randomization
E)All ideas of sampling should be included

Question 8

The online MBA director at a large business school surveys a sample of current students to Determine their level of satisfaction with the program.She finds that 67% are "very Satisfied" with the online program.This is a

A)statistic.
B)parameter.
C)target population.
D)sampling frame.
E)good result.

Question 9

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.

Question 10

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.

Question 11

Management at a retail store is 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.Several plans for choosing the sample are proposed.
Name the sampling strategy in each.
a. Randomly select an employee classification and test all the people who work in that classification - supervisors, fulltime clerks, part-time clerks, and maintenance staff. ________
b. Choose the fourth person that arrives to work for each shift. _________
c. There are four employee classifications: supervisors, fulltime clerks, part-time clerks, and maintenance staff.
Randomly select ten people from each category. ________________
d. Each employee has a three-digit identification number. Randomly choose 40 numbers. _____________

Question 12

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

A)the stratified sample reduces bias
B)the stratified sample reduces sample to sample variability
C)the stratified sample eliminates the need for randomization
D)the stratified random sample allows you to get information about each stratum
E)the stratified sample allows you to get more reliable estimates using the same sample size

Question 13

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.
$\begin{array}{llll}18192 & 95318 & 02975 & 01191\end{array}$
$\begin{array}{llll}29958 \quad 09275 & 89141 & 61909\end{array}$


$\begin{array}{|c|c|c|c|}\hline \text { Larry } & \text { Marissa } & \text { Tim } & \text { Diane } \\\hline \text { Carol } & \text { Joshua } & \text { Barbara } & \text { Allan } \\\hline \text { Rich } & \text { Sharyn } & \text { Brian } & \text { Kelly } \\\hline \text { Nicole } & \text { John } & \text { June } & \text { Frank } \\\hline \text { Steve } & \text { Andrea } & \text { Matthew } & \text { Erin } \\\hline\end{array}$

Question 14

Listed below are the names of 20 students who are juniors.Use the random numbers listed
below to select five of them to be in your sample.Clearly explain your method.
$$\begin{array}{l}\begin{array} { | l | l | l | l | l | } \hline \text { Adam } & \text { Chris } & \text { Dave } & \text { Deirdre } & \text { Dick } \\\hline \text { Ellen } & \text { Eric } & \text { Joan } & \text { John } & \text { Judi } \\\hline \text { Joy } & \text { Kenny } & \text { Laura } & \text { Mary } & \text { Paul } \\\hline \text { Peter } & \text { Rachel } & \text { Rob } & \text { Sara } & \text { Stacey } \\\hline\end{array}\\\\\begin{array} { l } 04028\quad55259\quad81183\quad40754\quad60209\quad06765\quad27306 \\28370\quad82669\quad83236\quad77479\quad90618\quad43707\quad78695\end{array}\end{array}$$

Question 15

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.

Question 16

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

A)of a bad sampling frame.
B)of an undefined target population.
C)leading questions.
D)of a voluntary response sample.
E)of measurement error.

Question 17

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.

Question 18

A consumer research group is interested in how older drivers view hybrid cars.Specifically, They wish to assess the percentage of drivers in the U.S.50 years of age or older who intend to purchase a hybrid in the next two years.They selected a systematic sample from a list of
AARP (American Association of Retired Persons) members.Based on this sample, they Estimated the percentage to be 17%.Which of the following statements about this study is True?

A)17% of all U.S.drivers 50 years of age or older intend to purchase a hybrid in the next two years.
B)17% is a parameter.
C)17% is a statistic.
D)Both A and B
E)Both A and C

Question 19

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

A)Simple Random Sampling
B)Stratified Sampling
C)Cluster Sampling
D)Systematic Sampling
E)Convenience Sampling

Question 20

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.

A)I only
B)II only
C)III only
D)I and III
E)I, II, and III

Question 21

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.

A)I only
B)I and II only
C)I and III only
D)II and III only
E)I, II, and III

Question 22

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)Simple Random Sampling
B)Stratified Sampling
C)Cluster Sampling
D)Systematic Sampling
E)Convenience Sampling

Question 23

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

A)Simple Random Sampling
B)Stratified Sampling
C)Cluster Sampling
D)Systematic Sampling
E)Convenience Sampling

Question 24

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?

A)all regular Molly's Reach customers
B)% of regular Molly's Reach customers who have concerns about online security
C)Molly's Reach customers who belong to the rewards program
D)% of Molly's Reach customers who belong to the rewards program that don't shop online
E)none of the above

Question 25

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.

A)parameter
B)statistic
C)target population
D)sampling frame
E)sample

Question 26

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.One member of the management team at Molly's Reach suggests that their survey could be conducted online.
Customers logging on to the online store would be asked to take a few minutes to completethe survey and would be offered a coupon as incentive to participate .Which of the following
Statements is true?

A)This is a voluntary response sample.
B)This would result in an unbiased random sample.
C)This would result in a biased sample.
D)Both A and B
E)Both A and C

Question 27

Which of the following survey questions is leading?

A)Given the prevalence of identity theft, are you reluctant to provide credit card information online?
B)Are you confident that any information you provide online is secure?
C)Are you concerned about the security of online transactions?
D)Both A and B
E)Both B and C

Question 28

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?

A)Yes, because a stratified sample is a type of simple random sample.
B)Yes, because the students were selected at random.
C)Yes, because each student had an equal chance to be selected.
D)No, because not all combinations of 24 students could have been chosen.
E)No, because each student did not have an equal chance of being selected.