1. In order to compare the effects of two drugs, called A and B, on white blood
ID: 3126278 • Letter: 1
Question
1. In order to compare the effects of two drugs, called A and B, on white blood cell counts, 20 students from Iowa State University were randomly selected and divided into two groups: 10 received drug A and 10 received drug B. Blood was drawn just before the drug was administered and 24 hours after the administration of the drug, and white blood cell counts were counted for each specimen. The 20 students were randomly allocated to two treatment groups (A and B), with 10 allocated to each group.
A. Describe the sample and the population.
B. Is this study an experimental or observational study? Describe the Response variable.
C. What are the treatment (experimental) groups? How many members of the sample are in each group?
D. Suppose we find that drug A significantly reduces the amount of white blood cells compared to drug B. Assuming that the sample is a representation of the population (ISU students), can we say that drug B is better than drug A? Note: White blood cells are cells of the immune system that fight infections, thus, loosing them is not a good thing.
2. Multiple Choice:
For a complete Factorial study with 4 factors, each with 3 levels, the number of observations is at least.
(1) 20
(2) 81
(3) 64
(4) none of the above
Based on the following Random digits [22896 62637 39630 63725]
The fourth widget selected from 30 widgets labeled 1, 2, …, 30 is
(1) 25
(2) 22
(3) 26
(4) 30
Explanation / Answer
1. In order to compare the effects of two drugs, called A and B, on white blood cell counts, 20 students from Iowa State University were randomly selected and divided into two groups: 10 received drug A and 10 received drug B. Blood was drawn just before the drug was administered and 24 hours after the administration of the drug, and white blood cell counts were counted for each specimen. The 20 students were randomly allocated to two treatment groups (A and B), with 10 allocated to each group.
A. Describe the sample and the population.
population : All ISU students
sample: selected 20 students
B. Is this study an experimental or observational study? Describe the Response variable.
Experimental study, because we are administering Drug A and Drug B on samples
C. What are the treatment (experimental) groups? How many members of the sample are in each group?
two groups: receiving drug A and receiving drug B
D. Suppose we find that drug A significantly reduces the amount of white blood cells compared to drug B. Assuming that the sample is a representation of the population (ISU students), can we say that drug B is better than drug A? Note: White blood cells are cells of the immune system that fight infections, thus, loosing them is not a good thing.
Yes, we can say that drug B is better than drug A because drug A significantly reduces the amount of white blood cells compared to drug B.
2. Multiple Choice:
For a complete Factorial study with 4 factors, each with 3 levels, the number of observations is at least.
(1) 20
(2) 81
(3) 64
(4) none of the above
3*3*3*3 =81
Based on the following Random digits [22896 62637 39630 63725]
The fourth widget selected from 30 widgets labeled 1, 2, …, 30 is
(1) 25
(2) 22
(3) 26
(4) 30
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