ECN 221 ASU EXAM -1 QUESTIONS WITH
COMPLETE SOLUTION GRADED A+
a life insurance company has determined that each week an average of 9 claims are
filed in its Denver branch. what is the probability that exactly 5 claims will be filed during
the next week? - 0.060727
a production process produces 5.9% defective parts. a sample of 21 parts from the
production process is selected. what is the probability that the sample contains exactly 2
defective parts? - 0.230211
the descriptive measure NOT measured in the same units as the original data is
the_____________. - variance
the correlation coefficient ranges from which 2 values? - -1 and +1
a numerical measure, such as a mean, computed from a population is known
as__________. - population parameter
excel's ___________ function can be used to compute the mean. - AVERAGE
the union of events A and B is the event containing ___________. - all the sample
points belonging to A or B or both
three applications to a local university are checked to determine whether each applicant
is male or female. the number of sample points in this experiment is _________. - 8
20% of people at a company picnic got food poisoning. what percent of people at the
picnic did NOT get food poisoning? - 80%
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 a measure of dispersion? - interquartile range
the sum of deviations of the individual data elements from their mean is_____. - always
equal to zero
the value of the sum of the squared deviations form the mean, i.e., summation(x-xbar)^2
must always be______. - at least zero
the interquartile range is_________. - the difference between the third and first quartiles
events A and B are mutually exclusive. which of the following statements is also true? -
P(A ∪ B) = P(A) + P(B)
COMPLETE SOLUTION GRADED A+
a life insurance company has determined that each week an average of 9 claims are
filed in its Denver branch. what is the probability that exactly 5 claims will be filed during
the next week? - 0.060727
a production process produces 5.9% defective parts. a sample of 21 parts from the
production process is selected. what is the probability that the sample contains exactly 2
defective parts? - 0.230211
the descriptive measure NOT measured in the same units as the original data is
the_____________. - variance
the correlation coefficient ranges from which 2 values? - -1 and +1
a numerical measure, such as a mean, computed from a population is known
as__________. - population parameter
excel's ___________ function can be used to compute the mean. - AVERAGE
the union of events A and B is the event containing ___________. - all the sample
points belonging to A or B or both
three applications to a local university are checked to determine whether each applicant
is male or female. the number of sample points in this experiment is _________. - 8
20% of people at a company picnic got food poisoning. what percent of people at the
picnic did NOT get food poisoning? - 80%
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 a measure of dispersion? - interquartile range
the sum of deviations of the individual data elements from their mean is_____. - always
equal to zero
the value of the sum of the squared deviations form the mean, i.e., summation(x-xbar)^2
must always be______. - at least zero
the interquartile range is_________. - the difference between the third and first quartiles
events A and B are mutually exclusive. which of the following statements is also true? -
P(A ∪ B) = P(A) + P(B)
