Question 3 A statistical study involves a data set of the different types of sho

Question

Question 3

A statistical study involves a data set of the different types of shoe designs by the designer Calvin Klein over the years from 1987 to 2014.

What type of observational study is this?

Question options:

A)

cross-sectional study

C)

Prospective study

D)

Experiment

Question 5

An Archaeologist undug and took measurements of the bones found in the remains of an ancient tribe that lived along the Judan river in the year 26BC. What type of study is this?

Question options:

A)

Cross-sectional study

C)

Prospective study

D)

Experiment

Question 9

Which statement best describes confounding variables?

Question options:

A)

They are confusing to find in an experiment.

C)

Their effects on the subjects cannot be distinguished from one another.

D)

They confuse the experts conducting the experiment.

Question 14

Which statement below explains how you would replicate an experiment?

Question options:

repeat the experiment on the same subject

create a new control and treatment group

Increase the number of subjects

Question 15

Determine whether the characteristic described in the following population is statistically significant or not. In a population, 80% of all new births are girls.

Question options:

B)

The birth of girls is significant because 80% is too large to be a result of chance.

C)

The birth of boys is significant because 20% boys are born.

D)

None of these

Question 16

Which statement explains why blinding is useful in an experiment?

Question options:

To not let anyone know that an experiment is conducted.

To increase replication in the experiment.

To reduce the bias that experts have in the experiment to force responses that are not true

Question 17

A large representative random sample of 6906 U.S. adults collected over 20 years showed that “parents reported higher levels of life satisfaction than nonparents,” with the observed difference in life satisfaction between the two groups being statistically significant. This is an example of

Question options:

A)

an observational study.

B)

a randomized comparative experiment.

D)

None of these

Question 22

Forty subjects are recruited in the study. Each subject recruited in the study has to drive with and without a cellphone. The drives with and without cell phone are scheduled for two different days. The two treatments (with and without cellphones) are assigned randomly as follows: On the first day, twenty subjects are randomly chosen to drive with cell phones, and the remaining twenty to drive without cell phones. The next day, those who drove without cellphones drive with cellphones and vice versa. What kind of experiment design is this? Choose the best answer.

Question options:

A)

Completely randomized design

B)

matched pairs design

D)

None of these

Question 23

  Men and women respond differently to advertisement. To conduct an experiment to determine the effectiveness of three different advertisements of the same product, a company manager separates men and women into different groups, and randomly display three different advertisements of a product to the different groups. The responses were collected for the different experiments and analyzed. What kind of experiment design is this?

Question options:

B)

matched pairs design

C)

block design

D)

none of these

Question 24

A math professor wants to determine whether calculators affect student performance. He randomly assigns calculators to half the students in her class. The remaining half were asked to not use calculators. The final scores for the two groups were collected and analyzed. What kind of experiment design is this?

Question options:

A)

Completely randomized design

B)

matched pairs design

D)

none of these

Question 3

Explanation / Answer

3

This is a prospective study , as the data about the shoes for calvin is collected OVER a period of time and not "in" time. Hence this is a prospective study.

Experiment must have a control and treatment group , which is not the case here too.

5

as the time is 26BC , it is "in" time. Hence this is a cross sectional study as we are measuring bones of a group along the river for a given time i.e 26BC .Experiment must have a control and treatment group , which is not the case here too.

9

confounding variables are variables whose effect on the experiment cant be controlled and thus they tend to damage the validity of the experiment

14

Replication generally refers to perfroming the same experiment but on different set of subjects . Hence the correct answer would be

create a new control and treatment group.

we can perform the same experiment but we must create a different set of control and treatment group so that the results can be obtained and the experiment is replicated in true sense

Please note that we can answer only 4 multiple choice questions at a time , as per the answering guidelines.

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