Question

11) a. In a designed experiment, what are the
experimental units?

b. If the experimental units are humans, what term is often used
in place of experimental unit?

a. Choose the correct answer below.

A.

The group receiving placebo

B.

The group receiving the specified treatment

C.

The individuals or items on which the experiment is performed

D.

The experimental conditions

12) In a designed experiment, there is one factor with four levels. How many treatments are there?

Choose the correct answer below.

A.

There are four treatments.

B.

There are sixteen treatments.

C.

There is one treatment.

D.

There are three treatments.

13) A magazine reported on the "... treatment-emergent adverse events that occurred in 2% or more patients treated with a new medicine and with incidence greater than placebo in the treatment of depression, OCD, or bulimia." In the study, 2434 patients took the new medicine and 1396 patients were given placebo. Identify the a. treatment group, b. control group, and c. treatments.

a. Which of the following is the treatment group?

A.

The 2434 patients who took the new medicine

B.

The new medicine

C.

The 1396 patients who took placebo

D.

The placebo

E.

The 3830 patients who took part in the study

A driver's ability to detect highway signs is an important consideration in highway safety. In his dissertation, S. Younes investigated the distance at which drivers can first detect highway caution signs. This distance is called the detection distance. Younes analyzed the effect that sign size and sign material have on detection distance. Drivers were randomly assigned to one combination of sign size (small, medium, and large), and sign material (1, 2, and 3). Each driver covered the same stretch of highway at a constant speed during the same time of day, and the detection distance, in feet, was determined for the driver's assigned caution sign. Complete parts (a) through (e) below.

a. Identify the experimental units. Select all that apply.

A.

the time of day

B.

the sign material

C.

the drivers

D.

the detection distance

E.

the sign size

F.

the driving speed

14) In a study, the effects of the mane of a male lion as a signal
of quality to mates and rivals was explored. Four life-sized
dummies of male lions provided a tool for testing female response
to the unfamiliar lions whose manes varied by length (long or
short) and color (blonde or dark). The female lions were observed
to see whether they approached each of the four life-sized
dummies. Complete parts (a) through (e) below.

a. Identify the experimental units. Choose the correct answer below.

The mane colors

The mane lengths

The male dummies

The female lions

15) In an experiment, the effect of using either a
conventional or experimental mouthwash was investigated. Eighteen
female and 18 male preschoolers were selected. Within each gender
group, nine were randomly assigned to the conventional mouthwash
and the remaining nine to the experimental mouthwash. After each
subject rinsed with the assigned mouthwash, a dental plaque index
was measured. The higher the dental plaque index, the greater was
the amount of plaque on an individual's teeth.

a. Is the statistical design described here a completely randomized
design or a randomized block design? Explain your answer.

b. If the statistical design is a randomized block design, what
are the blocks?

a. What kind of design is described?

A.

The experiment is a randomized block design because the
experimental units (the students) were first blocked by gender and
then randomly assigned to the treatments (the different kinds of
mouthwash).

B.

The experiment is a completely randomized design because the
experimental units (the students) were all randomly assigned to
the treatments (the types of mouthwash).

C.

The experiment is a completely randomized design because the
experimental units (the mouthwashes) were all randomly assigned
to the treatments (the genders of the students).

D.

The experiment is a randomized block design because the
experimental units (the students) were first blocked by mouthwash
and then randomly assigned to the treatments (gender).

E.

The experiment is a randomized block design because the
experimental units (the mouthwashes) were first blocked by the
gender of the students and then randomly assigned to the
treatments (the mouthwash type).

F.

The experiment is a randomized block design because the
experimental units (the mouthwashes) were first blocked by
mouthwash type and then randomly assigned to the treatments (the
genders of the students).

Answer #1

The experimental unit is the physical entity which can be assigned, at random, to a treatment.

11)

The experimental units are,

C.

The individuals or items on which the experiment is
performed

12)

The treatments are equivalent to the levels of factor.

A.

There are four treatments.

13)

a.

The treatment group is,

A.

The 2434 patients who took the new medicine

The experimental units are

C.

the drivers

14)

The experimental units is,

The female lions

15)

The kind of design is,

A.

The experiment is a randomized block design because the
experimental units (the students) were first blocked by gender and
then randomly assigned to the treatments (the different kinds of
mouthwash).

For a certain experiment, the available experimental units are
eight people: four females (f) and four males (m). Use (1f, 2f, 3f,
4f) to denote the females and (1m, 2m, 3m, 4m) to denote the males.
There are to be four treatment groups: A, B, C, and D. If a
randomized block design is used, with the experimental units
blocked by gender, which assignment of treatments is correct? (3
points)
A: (1f, 3f), B: (2f, 2m), C: (4f, 1m), D:...

For a certain experiment, the available experimental units are
12 people—six females (f) and six males (m). Use (1f, 2f, 3f, 4f,
5f, 6f) to denote the females and (1m, 2m, 3m, 4m, 5m, 6m) to
denote the males. There are to be six treatment groups: A, B, C, D,
E, and G. If a randomized block design is used, with the
experimental units blocked by gender, which assignment of
treatments is not correct?
A: (2f, 1m), B: (1f, 2m),...

1) Including only one sex and age group in the study will
reduce________ in the study and also reduce the______ among the
individuals making the study more powerful (although its
conclusions will only apply to that sex and age group)
QUESTION 4
Match the experimental design with the features that best
describe it.
- 1) .
Every combination of two or more treatment variables of interest
is investigated allowing researchers to test multiple variables and
their interaction...

In a completely randomized design, 12 experimental units were
used for the first treatment, 15 for the second treatment, and 20
for the third treatment. Complete the following analysis of
variance (to 2 decimals, if necessary). If your answer is zero
enter "0". Source of Variation Sum of Squares Degrees of Freedom
Mean Square F Treatments 1,300 Error Total 2,100 At a .05 level of
significance, is there a significant difference between the
treatments? The p-value is What is your...

A researcher is conducting a randomized, placebo-controlled
experiment to test the hypotheses H0:p1=p2 versus Ha:p1>p2H_a:
p_1 > p_2Ha:p1>p2 where p1= the population proportion of
all patients given the new drug who are cured and p2=the population
proportion of all patients given the placebo who are cured. The
patients were randomly assigned to the two treatment groups in a 2
to 1 ratio, that is, twice as many patients were randomized to the
new treatment as were to the placebo group....

In a completely randomized design, 12 experimental units were
used for the first treatment, 15 for the second treatment, and 20
for the third treatment. Complete the following analysis of
variance (to 2 decimals, if necessary). If the answer is zero enter
"0".
Source of Variation
Sum of Squares
Degrees of Freedom
Mean Square
F
p-value
Treatments
1100
Error
700
44
xx
xxxx
Total
1800
xx
xxx

In a completely randomized design, 10 experimental units were
used for the first treatment, 12 for the second treatment, and 19
for the third treatment. Sum of Squares due to Treatments and Sum
of Squares Total is computed as 1100 and 1700 respectively. Prepare
the ANOVA table and complete the same (fill out all the cells).
State the Hypotheses. At a .05 level of significance, is there a
significant difference between the treatments? Use both p-Value and
Critical-Value approaches.
Please...

In a completely randomized design, 12 experimental units were
used for the first treatment, 15 for the second treatment, and 20
for the third treatment. Complete the following analysis of
variance (to 2 decimals, if necessary). If the answer is zero enter
"0".
Source of Variation
Sum of Squares
Degrees of Freedom
Mean Square
F
p-value
Treatments
1,200
Error
Total
1,800
At a .05 level of significance, is there a significant
difference between the treatments?
The -value is - Select...

In a completely randomized design, 12 experimental units were
used for the first treatment, 15 for the second treatment, and 20
for the third treatment. Complete the following analysis of
variance (to 2 decimals, if necessary). If the answer is zero enter
"0".
Source of Variation
Sum of Squares
Degrees of Freedom
Mean Square
F
p-value
Treatments
1400
Error
Total
1800
At a .05 level of significance, is there a significant
difference between the treatments?
The p-value is - Select...

Subject bias can occur in an experiment when the participants
are aware of the purpose of the study and respond in a way that
they think the researchers want. For example, if participants
believe they are in a study to test if coffee improves your mood,
those who drank coffee might claim to be happier than they really
are.
Based on the information given, which of the following
experiments is most likely to have the issue of a control or...

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