HLTH 501 BIOSTATISTICS ACTUAL TEST 2026
QUESTIONS WITH VERIFIED ANSWERS
◉ The ______ (standard deviation or IQR) is a better indicator of the
spread of the main part of a distribution than the standard deviation
when the data are strongly skewed to one side or the other,
especially when there are extreme observations. Answer:
Interquartile range
◉ The ______ (std or IQR) is a better indication of the spread among
all of the data points. Answer: standard deviation
◉ Mutually Exclusive. Answer: when two events are not
simultaneously possible; Pr[A and B]=0
◉ probability distribution. Answer: a list of the probabilities of all
mutually exclusive outcomes of a random trial
◉ Addition rule of probability for mutually exclusive events. Answer:
If two events A and B are mutually exclusive, then
Pr[A or B]= Pr[A] + Pr[B]
◉ Pr[not A]= ?. Answer: 1-Pr[A]
, ◉ The general addition rule. Answer: Pr[A or B]= Pr[A] + Pr[B] -
Pr[A and B]
◉ independent events. Answer: occurrence of one event does not in
any way affect probability that the other will also occur
◉ The multiplication rule (if independent events). Answer: If two
events A and B are independent, then
Pr[A and B]= Pr[A] X Pr[B]
◉ conditional probability. Answer: probability of an event given that
another event occurs; probability of that event occurring given that a
condition is met; Pr[event|condition]
◉ General Multiplication Rule. Answer: probability that both of two
events occur even if the two are independent
Pr[A and B]= Pr[A]*Pr[B|A]
◉ The general multiplication reduces to the multiplication rule
when the events are independent.. Answer: Pr[B|A]= Pr[B]
◉ Bayes' Theorem. Answer: Pr[A|B]=(Pr[B|A] * Pr[A])/ Pr[B]
QUESTIONS WITH VERIFIED ANSWERS
◉ The ______ (standard deviation or IQR) is a better indicator of the
spread of the main part of a distribution than the standard deviation
when the data are strongly skewed to one side or the other,
especially when there are extreme observations. Answer:
Interquartile range
◉ The ______ (std or IQR) is a better indication of the spread among
all of the data points. Answer: standard deviation
◉ Mutually Exclusive. Answer: when two events are not
simultaneously possible; Pr[A and B]=0
◉ probability distribution. Answer: a list of the probabilities of all
mutually exclusive outcomes of a random trial
◉ Addition rule of probability for mutually exclusive events. Answer:
If two events A and B are mutually exclusive, then
Pr[A or B]= Pr[A] + Pr[B]
◉ Pr[not A]= ?. Answer: 1-Pr[A]
, ◉ The general addition rule. Answer: Pr[A or B]= Pr[A] + Pr[B] -
Pr[A and B]
◉ independent events. Answer: occurrence of one event does not in
any way affect probability that the other will also occur
◉ The multiplication rule (if independent events). Answer: If two
events A and B are independent, then
Pr[A and B]= Pr[A] X Pr[B]
◉ conditional probability. Answer: probability of an event given that
another event occurs; probability of that event occurring given that a
condition is met; Pr[event|condition]
◉ General Multiplication Rule. Answer: probability that both of two
events occur even if the two are independent
Pr[A and B]= Pr[A]*Pr[B|A]
◉ The general multiplication reduces to the multiplication rule
when the events are independent.. Answer: Pr[B|A]= Pr[B]
◉ Bayes' Theorem. Answer: Pr[A|B]=(Pr[B|A] * Pr[A])/ Pr[B]
