Question 15 Determine whether the characteristic described in the following popu

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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

Explanation / Answer

(15)

D) None of these, because the result is not significant to predict either boy's or girl's birth

(16)

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

(17)

A) an observational study, because it doesn't qualify for a comparitive randomized design because the subjects are not actually subjected to any treatment conditions. It's a simple observation between two groups

(22)

B) matched pairs design, because a completely randomized design would have been the case when all 40 drove with cell phones on same day and without cell phones on the other day

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