HS 4510: BIOSTATISTICS FINAL EXAM PREP
QUESTIONS & ANSWERS
The mean and the standard deviation of a frequency distribution that follows a normal
distribution are 20 and 5, respectively. Ninety-five percent of the scores will fall
between:
a. 5 and 40
b. 15 and 25
c. 17.5 and 25.5
d. 10 and 30 - Answer -d. 10 and 30
The mean of a frequency distribution is 32. If each score in the frequency distribution is
divided by 2, the mean of the new distribution will be:
a. 64
b. 16
c. 32
d. not enough information provided - Answer -c. 32
You want to compare the number of male and female patients by ethnic/racial groups.
There are 20 different races. For the chi-square test, the number of degrees of freedom
is:
a. 19
b. 20
c. 21
d. 2 - Answer -a. 19
Generalizability of a study is also known as:
a. External validity
b. Internal validity
c. Reliability
d. Internal consistency - Answer -a. External validity
We have conducted a one-way ANOVA test in which we compared three population
means. The calculated F equals 4.73, and the critical value of F is 3.58. Under this
circumstance, we would:
a. reject the Null hypothesis
b. conduct post hoc procedures
c. fail to reject the Null hypothesis
, d. both a and b - Answer -d. both a and b *
It is easier for a statistical test to achieve statistical significance when we conduct a:
a. two-tailed test
b. non-directional test
c. one-tailed test
d. the direction of the statistical test does not influence statistical significance - Answer
-c. one-tailed test *
The joint probability for two independent events, A and B, to occur is denoted:
a. P(A) + P(B)
b. P(A) - P(A) * P(B)
c. [P(A) * P(B)] - [P(A)+P(B)]
d. P(A) * P(B) - Answer -d. P(A) * P(B)
You want to compare the proportion of male and female patients discharged by hospital
ward. There are 10 wards. For the best nominated test, the number of degrees of
freedom is:
a. 1
b. 8
c. 9
d. 10 - Answer -c. 9
You want to measure the level of patients' satisfaction with a set of health services
newly introduced to a community practice. You decided to investigate that through a
survey question with a 5-point Likert-type scale consisting of statements that measure
level of satisfaction with the health care service. The Likert scale ranged from 1 to 5;
where 1=highly satisfied, 2=satisfied, 3=cannot decide, 4= not satisfied, and 5=totally
not satisfied.
After reviewing the survey, you decide that the mode might be the more appropriate
measure of central tendency for this variable. In reporting the mode, you are treating the
variable as:
a. ordinal
b. ratio
c. nominal
d. interval - Answer -a. ordinal
Stability is a measure of:
a. Reliability
b. Validity
c. Both reliability and validity
QUESTIONS & ANSWERS
The mean and the standard deviation of a frequency distribution that follows a normal
distribution are 20 and 5, respectively. Ninety-five percent of the scores will fall
between:
a. 5 and 40
b. 15 and 25
c. 17.5 and 25.5
d. 10 and 30 - Answer -d. 10 and 30
The mean of a frequency distribution is 32. If each score in the frequency distribution is
divided by 2, the mean of the new distribution will be:
a. 64
b. 16
c. 32
d. not enough information provided - Answer -c. 32
You want to compare the number of male and female patients by ethnic/racial groups.
There are 20 different races. For the chi-square test, the number of degrees of freedom
is:
a. 19
b. 20
c. 21
d. 2 - Answer -a. 19
Generalizability of a study is also known as:
a. External validity
b. Internal validity
c. Reliability
d. Internal consistency - Answer -a. External validity
We have conducted a one-way ANOVA test in which we compared three population
means. The calculated F equals 4.73, and the critical value of F is 3.58. Under this
circumstance, we would:
a. reject the Null hypothesis
b. conduct post hoc procedures
c. fail to reject the Null hypothesis
, d. both a and b - Answer -d. both a and b *
It is easier for a statistical test to achieve statistical significance when we conduct a:
a. two-tailed test
b. non-directional test
c. one-tailed test
d. the direction of the statistical test does not influence statistical significance - Answer
-c. one-tailed test *
The joint probability for two independent events, A and B, to occur is denoted:
a. P(A) + P(B)
b. P(A) - P(A) * P(B)
c. [P(A) * P(B)] - [P(A)+P(B)]
d. P(A) * P(B) - Answer -d. P(A) * P(B)
You want to compare the proportion of male and female patients discharged by hospital
ward. There are 10 wards. For the best nominated test, the number of degrees of
freedom is:
a. 1
b. 8
c. 9
d. 10 - Answer -c. 9
You want to measure the level of patients' satisfaction with a set of health services
newly introduced to a community practice. You decided to investigate that through a
survey question with a 5-point Likert-type scale consisting of statements that measure
level of satisfaction with the health care service. The Likert scale ranged from 1 to 5;
where 1=highly satisfied, 2=satisfied, 3=cannot decide, 4= not satisfied, and 5=totally
not satisfied.
After reviewing the survey, you decide that the mode might be the more appropriate
measure of central tendency for this variable. In reporting the mode, you are treating the
variable as:
a. ordinal
b. ratio
c. nominal
d. interval - Answer -a. ordinal
Stability is a measure of:
a. Reliability
b. Validity
c. Both reliability and validity
