Which one of the following statements is false? a. An observational study is a s
ID: 1770196 • Letter: W
Question
Which one of the following statements is false?
a. An observational study is a study based on data in which the levels are manipulated.
b. An experiment manipulates factors and their levels to create treatments.
c. Because retrospective studies are sometimes based upon historical data, they may have errors.
d. A prospective study is an example of an observational study.
Use the following information to answer the next two questions. Dairy farmers across Illinois are trying to determine which cows produce the most milk. To find this, a dairy farmer conducts an experiment by playing slow or fast music in the cow shed, and the vitamin dosage the cow receives, 0 ml, 100 ml, and 300 ml. 2. How many factors are in this experiment, and what are they?
(a) 2 factors: slow and fast music
(b) 2 factors: cows and farmers
(c) 6 factors: slow music-0 ml, slow music-100 ml, slow music-300 ml, fast music- 0 ml, fast music-100 ml, fast music-300 ml.
(d) 2 factors: type of music and vitamin dosage 3.
What is the response variable for this experiment?
(a) Vitamin dosage
(b) Amount of milk produced
(c) Gender
(d) Cows
4. An examination of the medical records of more than 360,000 Swedish men showed that those who were overweight or who had high blood pressure had a higher risk of kidney cancer. Which one of the following is true?
a. This is an example of a survey
b. This is an example of a retrospective study
c. This is an example of a prospective study
d. This is an example of a completely randomized experiment
SHOW ALL THE WORK
Explanation / Answer
Answer
a. An observational study is a study based on data in which the levels are manipulated is the fals statement because the observational study is a real study and there should not any manipulation.
Answer
(c) 6 factors: slow music-0 ml, slow music-100 ml, slow music-300 ml, fast music- 0 ml, fast music-100 ml, fast music-300 ml.
SLOW MUSIC
FAST MUSIC
vitamin dosage
Amount of milk produced
vitamin dosage
Amount of milk produced
0 ml
0 ml
100 ml
100 ml
300 ml
300 ml
Answer
(b) Amount of milk produced
is the response variable for this experiment
Answer
a. This is an example of a survey
SLOW MUSIC
FAST MUSIC
vitamin dosage
Amount of milk produced
vitamin dosage
Amount of milk produced
0 ml
0 ml
100 ml
100 ml
300 ml
300 ml
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