ECN 221 Exam 1 Study Guide – Arizona State
University – Core Concepts in Statistics and
Probability
two events are mutually exclusive if______. they have no sample points in common
Performance Boating gets 52% of its sparks plugs from Sparks Unlimited and the rest of its spark
plugs from United Engines. In the past 5% of the spark plugs from Sparks Unlimited are
defective and 11% of the spark plugs from United Engines are defective. A spark plug is
defective, what is the probability it came from Sparks Unlimited? 0.32995
Precision Manufacturing gets 41% of its valves from Hammond Inc. and the rest of its valves
from SINGER. Historically 0.12% of the valves it gets from Hammond Inc. are defective and
0.03% of the valves it gets from SINGER are defective. A valve is found to be defective, what is
the probability the valve came from SINGER? 0.26457
the student body of a large university consists of 61% female students. a random sample of 8
students is selected. what is the probability among the students in the sample at least 7 are
female? 0.117224
a marketing manager instructs his team to make 80 telephone calls to attempt to sell an
insurance policy. the random variable in this experiment is the number of sales made. this
random variable is a ______________. discrete random variable
when dealing with the number of occurrences of an even over a specified interval of time or
space and when the occurrence or nonoccurrence in any interval is independent of the
occurrence or nonoccurrence in any other interval, the appropriate probability distribution is a
_______________. poisson distribution
, 40% of all registered voters in the national election are female. a random sample of 5 voters is
selected. what is the random variable in this experiment? the number of female voters
out of 5
a sample point refers to a(n)__________. individual outcome of an experiment
the probability of the intersection of two mutually exclusive events___________. must
always be equal to 0
if P(A|B)=.3 and P(B)=.8, then_____. .24
the expected value of a discrete random variable___________. is the average value for
the random variable over many repeats of the experiment
highway patrol officers measure the speed of automobiles on a highway using radar equipment.
the random variable in this experiment is speed, measured in mph. this random variable is a
_____________. continuous random variable
which of the following is(are) required condition(s) for a discrete probability function?
none of the following
sample point measures_______. individual outcome of experiment
qualititative gender, marital status
quantitative numeric values
University – Core Concepts in Statistics and
Probability
two events are mutually exclusive if______. they have no sample points in common
Performance Boating gets 52% of its sparks plugs from Sparks Unlimited and the rest of its spark
plugs from United Engines. In the past 5% of the spark plugs from Sparks Unlimited are
defective and 11% of the spark plugs from United Engines are defective. A spark plug is
defective, what is the probability it came from Sparks Unlimited? 0.32995
Precision Manufacturing gets 41% of its valves from Hammond Inc. and the rest of its valves
from SINGER. Historically 0.12% of the valves it gets from Hammond Inc. are defective and
0.03% of the valves it gets from SINGER are defective. A valve is found to be defective, what is
the probability the valve came from SINGER? 0.26457
the student body of a large university consists of 61% female students. a random sample of 8
students is selected. what is the probability among the students in the sample at least 7 are
female? 0.117224
a marketing manager instructs his team to make 80 telephone calls to attempt to sell an
insurance policy. the random variable in this experiment is the number of sales made. this
random variable is a ______________. discrete random variable
when dealing with the number of occurrences of an even over a specified interval of time or
space and when the occurrence or nonoccurrence in any interval is independent of the
occurrence or nonoccurrence in any other interval, the appropriate probability distribution is a
_______________. poisson distribution
, 40% of all registered voters in the national election are female. a random sample of 5 voters is
selected. what is the random variable in this experiment? the number of female voters
out of 5
a sample point refers to a(n)__________. individual outcome of an experiment
the probability of the intersection of two mutually exclusive events___________. must
always be equal to 0
if P(A|B)=.3 and P(B)=.8, then_____. .24
the expected value of a discrete random variable___________. is the average value for
the random variable over many repeats of the experiment
highway patrol officers measure the speed of automobiles on a highway using radar equipment.
the random variable in this experiment is speed, measured in mph. this random variable is a
_____________. continuous random variable
which of the following is(are) required condition(s) for a discrete probability function?
none of the following
sample point measures_______. individual outcome of experiment
qualititative gender, marital status
quantitative numeric values
