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BIOSTATS EXAM 1 REVIEW QUESTIONS AND ASWERS
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BIOSTATS EXAM 1 REVIEW QUESTIONS AND ASWERS
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BIOSTATS EXAM 1 REVIEW QUESTIONS AND ASWERSWhich of the following variables is/are quantitative? (Mark all that apply)
The number of people in a randomly selected classroom on campus
The 3 most common brands of car found in the US
The telephone number of a randomly selected business in town - Answers- The
number of people in a randomly selected classroom on campus
Which one of the following is a statistically valid reason for sampling randomly when
choosing subjects for a study?
Correct Response
Sampling randomly tends to reduce sampling bias or risk
Sampling randomly (with a large sample) gives a perfect reflection of the population
Sampling randomly is easier than sampling nonrandomly
Actually, there is no statistically valid reason for sampling randomly - Answers-
Sampling randomly tends to reduce sampling bias or risk
A study conducted by researchers from the Department of Education wanted to know
the average debt of college students in the United States. In order to obtain a sample
representative of all students, the researchers divided college students into the four
classes (freshman, sophomore, junior, and senior) and then took a random sample of
students from each class. Which sampling method did they use?
Stratified random sampling
Systematic random sampling
Cluster sampling
Simple random sampling - Answers- Stratified random sampling
,Students in an Introductory Statistics class at BYU-Idaho were studying prices of cold
cereal at grocery stores in Rexburg. To get a sample of cold cereal prices, they went to
Albertson's and rolled a die to decide which box from the left of the top shelf they would
start on. They then recorded every 6th cereal after the first, moving from left to right
down the shelves, recording the name, size, and price of each cereal in their sample.
Which sampling method did they use?
Stratified random sampling
Systematic random sampling
Cluster sampling
Simple random sampling - Answers- Systematic random sampling
Is the study described in the previous question an experiment or an observational study,
and why?
An experiment, because the students had control over which sampling method they
used
An experiment, because the students had control over which cereals would be selected
for the study
An observational study, because the students had no control over the price of the
individual cereals
An observational study, because the students had no control over which cereals were
selected - Answers- An observational study, because the students had no control over
the price of the individual cereals
Which of the following studies depicts an observational study?
A parent group examines 25 recently released PG-13 movies and records the number
of sexual innuendos and curse words that occur in each.
, A sample of 504 patients in early stages of Alzheimer's disease is divided into two
groups. One group receives an experimental drug and the other a placebo. The
advance of the disease is tracked at one-month intervals over the next year. - Answers-
A parent group examines 25 recently released PG-13 movies and records the number
of sexual innuendos and curse words that occur in each.
Say that you are a researcher for a large pharmaceutical company that has produced a
new drug that is believed to help reduce the risk of developing arthritis. You test the
drug and compare it to a placebo by randomly choosing one group of men and women
in their 50's to take the drug and one group of men and women in their 50's to take a
placebo. Each participant takes the drug or placebo for a period of 10 years, after which
the effects of the drug are measured against the effects of the placebo. What (or who)
are the experimental units or subject?
All men and women in their 50's
The men and women who took the drug or placebo
The researchers
The drug and placebo - Answers- The men and women who took the drug or placebo
Say that you are a researcher for a large pharmaceutical company that has produced a
new drug that is believed to help reduce the risk of developing arthritis. You test the
drug and compare it to a placebo by randomly choosing one group of men and women
in their 50's to take the drug and one group of men and women in their 50's to take a
placebo. Each participant takes the drug or placebo for a period of 10 years, after which
the effects of the drug are measured against the effects of the placebo. What are the
treatments?
All men and women in their 50's
The men and women who took the drug or placebo
The researchers
Only the men and women who took the drug
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