HS 4510 – BIOSTATISTICS QUESTIONS & ANSWERS
Which of the below relates to inferential statistics?
Select one:
a.
modeling
b.
hypothesis testing
c.
prediction
d.
estimation
e.
all of the above - Answer -all of the above
You are investigating the association of past falls with recent head injury in a group of
elderly patients admitted to a trauma unit in a regional hospital. One variable you
collected is "Past history of falls". State what is the scale of this variable?
Select one:
a.
Ratio variable
b.
Ordinal variable
c.
Interval variable
d.
Nominal variable - Answer -Nominal variable
The below table describes number of people found having hypertension in 2016 by
different regions. In which region, risk of having hypertension is the highest?
Region
Number of total population
Overall cases of hypertension
A
43,700
4,500
B
2,000
200
C
100,000
7,000
D
7,500
500
,Select one:
a.
Region A
b.
Region B
c.
Region C
d.
Region D
e.
Not enough information to answer the question - Answer -Not enough information to
answer the question
True or False: You will be working with nominal data if you will be comparing blood type
groups. - Answer -True
For the following sequences:
X {1, 2, 3}
Y{3, 4, 5}
Calculate the following: √(2Σxy)
Select the correct answer.
Select one:
a.
12.0
b.
5.71
c.
7.21
d.
12.45 - Answer -7.21
Select the statement that shows strong to weaker scales
Select one:
a.
nominal, categorical, ordinal, interval, ratio
b.
ordinal, interval, nominal, ratio, categorical
c.
ratio, interval, ordinal, categorical, nominal
d.
interval, ratio, categorical, ordinal, nominal - Answer -ratio, interval, ordinal, categorical,
nominal
Relating to relative frequencies, choose best answer:
Select one:
a.
, The sum of relative frequencies is 100%
b.
A relative frequency describes one element relative to all
c.
Categorical data can be described in relative frequencies
d.
All the above - Answer -All the above
If you are comparing number of births to the number of pregnancies in a sample of
women, you will be gathering:
Select one:
a.
nominal data
b.
ratio data
c.
interval data
d.
ordinal data - Answer -ratio data
Census data:
Select one:
a.
are not representative of the overall general population
b.
include all members of a population of interest
c.
are similar to sample data
d.
include only interval or ratio scale variables - Answer -include all members of a
population of interest
True or False: observations of a random variable in a random experiment is termed as
trial. - Answer -True
In two experiments conducted on similar study populations, two researchers measured
blood pressure and calculated the standard deviations for the mean of their sample. The
first researcher reported a mean blood pressure of 140 mm Hg with SD of 60 mm Hg;
the second researcher reported a mean blood pressure of 142 mm Hg with SD of 10
mm Hg. How can you explain this result?
Select one:
a.
Both populations seem similar in terms of their blood pressure, as 140 mm Hg is not
that different from 142 mm Hg
b.
The distribution of the blood pressure observations in both samples is the same
Which of the below relates to inferential statistics?
Select one:
a.
modeling
b.
hypothesis testing
c.
prediction
d.
estimation
e.
all of the above - Answer -all of the above
You are investigating the association of past falls with recent head injury in a group of
elderly patients admitted to a trauma unit in a regional hospital. One variable you
collected is "Past history of falls". State what is the scale of this variable?
Select one:
a.
Ratio variable
b.
Ordinal variable
c.
Interval variable
d.
Nominal variable - Answer -Nominal variable
The below table describes number of people found having hypertension in 2016 by
different regions. In which region, risk of having hypertension is the highest?
Region
Number of total population
Overall cases of hypertension
A
43,700
4,500
B
2,000
200
C
100,000
7,000
D
7,500
500
,Select one:
a.
Region A
b.
Region B
c.
Region C
d.
Region D
e.
Not enough information to answer the question - Answer -Not enough information to
answer the question
True or False: You will be working with nominal data if you will be comparing blood type
groups. - Answer -True
For the following sequences:
X {1, 2, 3}
Y{3, 4, 5}
Calculate the following: √(2Σxy)
Select the correct answer.
Select one:
a.
12.0
b.
5.71
c.
7.21
d.
12.45 - Answer -7.21
Select the statement that shows strong to weaker scales
Select one:
a.
nominal, categorical, ordinal, interval, ratio
b.
ordinal, interval, nominal, ratio, categorical
c.
ratio, interval, ordinal, categorical, nominal
d.
interval, ratio, categorical, ordinal, nominal - Answer -ratio, interval, ordinal, categorical,
nominal
Relating to relative frequencies, choose best answer:
Select one:
a.
, The sum of relative frequencies is 100%
b.
A relative frequency describes one element relative to all
c.
Categorical data can be described in relative frequencies
d.
All the above - Answer -All the above
If you are comparing number of births to the number of pregnancies in a sample of
women, you will be gathering:
Select one:
a.
nominal data
b.
ratio data
c.
interval data
d.
ordinal data - Answer -ratio data
Census data:
Select one:
a.
are not representative of the overall general population
b.
include all members of a population of interest
c.
are similar to sample data
d.
include only interval or ratio scale variables - Answer -include all members of a
population of interest
True or False: observations of a random variable in a random experiment is termed as
trial. - Answer -True
In two experiments conducted on similar study populations, two researchers measured
blood pressure and calculated the standard deviations for the mean of their sample. The
first researcher reported a mean blood pressure of 140 mm Hg with SD of 60 mm Hg;
the second researcher reported a mean blood pressure of 142 mm Hg with SD of 10
mm Hg. How can you explain this result?
Select one:
a.
Both populations seem similar in terms of their blood pressure, as 140 mm Hg is not
that different from 142 mm Hg
b.
The distribution of the blood pressure observations in both samples is the same
