Sampling
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Experimental Design
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Credits

Sampling - 100
49, 34, and 48 students are selected from the sophomore,
Junior, and Senior classes with 496, 348, and 481 students respectively a.) Stratified b.) Random c.) Cluster d.) Systematic e.) Convenience
Answer

Sampling - 200
A sample consists of every 49th student from a group of
496 students.
a.) Stratified b.) Random c.) Cluster d.) Systematic e.) Convenience
Answer

Sampling - 300
A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers a.) random b.) convenience c.) cluster d.) systematic e.) stratified
Answer

Sampling - 400
To avoid working late, a quality control analyst simply inspects the first 100 items produced. This is what type of sample?
a.) random b.) convenience c.) cluster d.) systematic e.) stratified
Answer

Sampling - 500
The name of each contestant is written on a separate card, the cards are placed in a bag, and three names are picked from the bag.
a.) random b.) convenience c.) systematic d.) cluster e.) stratified
Answer

Sampling - 600
An education researcher randomly selects 48 middle schools and interviews all the teachers at each school a.) random b.) cluster c.) systematic d.) convenience e.) stratified
Answer

Sampling - 100 Answer
49, 34, and 48 students are selected from the sophomore,
Junior, and Senior classes with 496, 348, and 481 students respectively a.) Stratified
Students were first divided up by class (strata), then selected at random

Sampling - 200 Answer
A sample consists of every 49th student from a group of
496 students.
d.) Systematic
The 49 th position was randomly selected, the systematic is that each 49 th position then becomes part of the sample

Sampling - 300 Answer
A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers a.) random
Every individual in the population had an equally-likely chance of being chosen and every sample of size 500 had an equally-likely chance of being chosen

Sampling - 400 Answer
To avoid working late, a quality control analyst simply inspects the first 100 items produced. This is what type of sample?
b.) convenience
The first 100 were convenient to the control analyst

Sampling - 500 Answer
The name of each contestant is written on a separate card, the cards are placed in a bag, and three names are picked from the bag.
a.) random
Each contestant has an equally-likely chance of being chosen and each sample of size three has an equally likely chance of being chosen

Sampling - 600 Answer
An education researcher randomly selects 48 middle schools and interviews all the teachers at each school b.) cluster
All the teachers in each randomly chosen school are interviewed—(the schools are natural groups within the population)

Determine whether the following is an observational study or an experiment
A marketing firm does a survey to find out how many people use a product. Of the one hundred people contacted, fifteen said they use the product.
a.) Observational b.) Experiment
Answer

Determine whether the following is an experiment or an observational study
A clinic gives a drug to a group of ten patients and a placebo to another group of ten patients to find out if the drug has an effect on the patients illness.
a.) Observational b.) Experiment
Answer

Which of the following is not a major principle of experimental design?
a.) randomization b.) replication c.) blocking d.) control e.) all of these are important principles
Answer

n
In order to assess the effects of diet on reducing cholesterol, a researcher randomly assigned 50 people to diet A and fifty people to diet B. They all reported to a clinic to have their cholesterol measured. The subjects were unaware of which diet they were using, and the technician measuring the cholesterol was not aware of which diet the participants had used. This is a(n) a.) observational study b.) experiment, but not a double blind experiment c.) double blind experiment d.) matched pairs experiment e.) block design
Answer

n
An experiment was conducted by some students to explore the nature of the relationship between a person's heart rate (measured in beats per minute) and the frequency at which that person stepped up and down on steps of various heights. Three rates of stepping and two different step heights were used. A subject performed the activity (stepping at one of the three stepping rates at one of the two possible heights) for three minutes. Heart rate was then measured at the end of this period. The variables "stepping rate" and "step height" are the a.) factors b.) levels c.) controls d.) units e.) response variables
Answer

A study to see the effects of caffeine on college student was conducted. Students in 2 class times were part of the study.
Suppose half of the 8:30 students are randomly allocated to the treatment group (two cups of coffee), the other half to the control group (two cups of decaf). In addition, half of the 9:30 students are randomly allocated to the treatment group, the other half to the control group. This is an example of a
A) voluntary response study.
B)
C) stratified sampling procedure. matched pairs design.
D)
E) completely randomized design. block design.
Answer

Determine whether the following is an observational study or an experiment
A marketing firm does a survey to find out how many people use a product. Of the one hundred people contacted, fifteen said they use the product.
a.) Observational
No treatment was imposed

Determine whether the following is an experiment or an observational study
A clinic gives a drug to a group of ten patients and a placebo to another group of ten patients to find out if the drug has an effect on the patients illness.
b.) Experiment
The patients were given either a drug or placebo then the effects were measured

Which of the following is not a major principle of experimental design?
e.) all of these are important principles
The four principles of design are control, randomization, replication, and blocking

In order to assess the effects of diet on reducing cholesterol, a researcher randomly assigned 50 people to diet A and fifty people to diet B. They all reported to a clinic to have their cholesterol measured. The subjects were unaware of which diet they were using, and the technician measuring the cholesterol was not aware of which diet the participants had used. This is a(n) c.) double blind experiment
A treatment was applied (the two diets)—and neither the subjects nor the technician knew which diet
(group) the subjects were in.

An experiment was conducted by some students to explore the nature of the relationship between a person's heart rate (measured in beats per minute) and the frequency at which that person stepped up and down on steps of various heights. Three rates of stepping and two different step heights were used. A subject performed the activity (stepping at one of the three stepping rates at one of the two possible heights) for three minutes. Heart rate was then measured at the end of this period. The variables "stepping rate" and
"step height" are the a.) factors
The variables “stepping rate” and “step height” are factors.
“Stepping rate” has 3 levels and “step height” has 2 levels . This means that there are
6 possible treatments .

A study to see the effects of caffeine on college student was conducted.
Students in 2 class times were part of the study. Suppose half of the 8:30 students are randomly allocated to the treatment group (two cups of coffee), the other half to the control group (two cups of decaf). In addition, half of the 9:30 students are randomly allocated to the treatment group, the other half to the control group. This is an example of a
E) block design.
Students are “blocked” by time of class (a variable that may affect the response variable) and then randomly assigned to the treatment or control group

Questions have come from the
Test Bank for
Basic Practice of Statistics
And
Essentials of Statistics