SOLUTION TO PROBABILITY AND STATISTICS FOR COMPUTER SCIENTIST
STATS 330

Fall 2015
Conditional Probability
Conditional probability is the probability of an event occurring,
given that another event has already
occurred.
Conditional probability restricts the sample space.
The conditional probability of event B occurring, given that
event
SOLUTION TO PROBABILITY AND STATISTICS FOR COMPUTER SCIENTIST
STATS 330

Fall 2015
Exercise Set A
'1. In the US. in 2000, there were 2.4 nn‘llian deaths from all causes. compared :0
19 million in 1970—31 25% increase.1U True or false, and expiain: the dam show
{hat the publicist heal Eh got worse over the period 1970w2000. CONFOUNDING 2
SOLUTION TO PROBABILITY AND STATISTICS FOR COMPUTER SCIENTIST
STATS 330

Fall 2015
Exercise Set A
1.
False. In 1960, the total U.S. population was 179,323,175; thus, the death rate was
approximately 0.0095. In 1990, the total population was 248,709,873; the death rate
was approximately 0.0084. By comparing rates rather than absolute num
SOLUTION TO PROBABILITY AND STATISTICS FOR COMPUTER SCIENTIST
STATS 330

Fall 2015
BioStatistics
Overview
Overview
Basic study designs; measures of
disease frequency and association
Teaser 1, Unit 2
2000 NEJM study on rofecoxib vs.
naproxen, Randomized Trial
Teaser 2, Unit 2
Results: Myocardial infarctions were
less common in the napro