Introduction to Statistics Exam Questions and Correct Answers Latest Update 2024-2025 (Graded A+)
data - Answers collections of observations (measurement, genders, survey responses)
statistics - Answers the science of planning studies and experiments, obtaining data, and then
organizing, summarizing, presenting, analyzing, interpreting, and drawing conclusions based on the data
population - Answers the complete collection of all measurements or data that are being considered
census - Answers the collection of data from every member of the population
sample - Answers sub-collection of members selected from a population
random selection - Answers selection of sample elements in such a way that all elements available for
selection have the same chance of being selected
a school newspaper decides to survey all the students enrolled in a gym class to determine the
percentage of these students who are also on the football team. what is the population of this study? -
Answers students who take gym class
a utility company currently offers electricity to its customers from a windmill farm. it is considering
offering electricity from a coal powered plant at a lower price. the company received a study from a coal
producing company showing that customers would buy the cheaper electricity. is there any incentive for
the survey to be biased? - Answers yes, because the coal company may benefit from the results of the
survey
a lawn service provider in your area would like to introduce a new service to its customers. the company
put flyers on each of their customers' doors asking them to call in and say whether or not they would
use this new service. the service received 73 phone calls, 65 of which would use the service. which
sampling method was used? - Answers voluntary response
a magician flips a coin 8 times producing heads each time. is there statistical significance to say the coin
is somehow rigged? - Answers yes, because the results are unlikely to happen by chance
a study was made to find if the distance people lived from where they worked was affected by whether
or not they had college degrees. it was found without a college degree, a person traveled an average
distance 12. 3 mi to work. with a college degree, a person traveled 24.2 mi to work. are the results
practically significant? - Answers yes, because the distance for those with a degree is almost twice that
of those who do not
in a study of fast food restaurants, 120 restaurants started with an average price of $2.32 per item.
during a six month period the average price increased by $0.30. does this study have practial
significance? - Answers yes, because the increase has an impact on the customer
you flip a coin and get tails - Answers possible and likely
lightening strikes the same spot twice - Answers possible but very unlikely
, in a study, subjects were found using the method as follows: "we recruited study candidates from the
greater boston area using newspaper ads and tv publicity." which sampling method was used? - Answers
voluntary response
a recent poll contacted 230 people who own a car and live in california and asked whether or not they
were a homeowner. identify the population of this poll - Answers all people who live in california and
own a car
In a study of a weight loss program, 40 subjects lost a mean of 3.0 Ibs after 12 months. Does the weight
loss program have practical significance? - Answers no, because the mean weight loss of 3.0 lbs after
one year does not seem to justify the program
a lumberyard wanted to do a survey to see if its customers were interested in purchasing rope along
with lumber. what group should do the study so the bias is minimal? - Answers a university
while driving your car gets two flat tires at the same time - Answers possible but very unlikely
a study of a new medical procedure selected 27 candidates from a pool of 583 potential candidates.
what sampling method was used? - Answers random selection
a student picked three different points on a line, and he noticed that all three points were also on the
same circle - Answers impossible
you are the one-millionth customer in line - Answers possible but very unlikely
A study compared surgery and splinting for subjects suffering from carpal tunnel syndrome. It was found
that among 73 patients treated with surgery, there was a 92% success rate. Among 83 patients treated
with splints, there was a 72% success rate. Calculations using those results showed that if there really is
no difference in success rates between surgery and splints, then there is about 1 chance in 1000 of
getting success rates like the ones obtained in this study. Which statement cannot be said? - Answers
A small club wanted to see if its membership wanted to make an expansion to its dining hall. In order to
do this, the club held a meeting in which every member who attended got one vote. Which sampling
method was used? - Answers census
A bag contains 10 red marbles and 3 blue marbles. Susan picked two marbles from the bag without
replacing them, and she chose 2 red marbles. - Answers possible and likely
A foresting service conducted a survey to see if tree farms that planted hardwood trees were more
profitable over a 30-year period than tree farms that planted softwood trees. The results of this study
showed that hardwood trees had a 46% higher profit per acre. Are the results statistically significant? -
Answers yes. because planting hardwood trees have a higher profit per acre
One of Gregor Mendel's famous hybridization experiments with peas yielded 580 offspring with 152 of
those peas (or 26%) having yellow pods. According to Mendel's theory, 25% of the offspring peas should
have yellow pods. Do the results of the experiment differ from Mendel's claimed rate of 25% by an
data - Answers collections of observations (measurement, genders, survey responses)
statistics - Answers the science of planning studies and experiments, obtaining data, and then
organizing, summarizing, presenting, analyzing, interpreting, and drawing conclusions based on the data
population - Answers the complete collection of all measurements or data that are being considered
census - Answers the collection of data from every member of the population
sample - Answers sub-collection of members selected from a population
random selection - Answers selection of sample elements in such a way that all elements available for
selection have the same chance of being selected
a school newspaper decides to survey all the students enrolled in a gym class to determine the
percentage of these students who are also on the football team. what is the population of this study? -
Answers students who take gym class
a utility company currently offers electricity to its customers from a windmill farm. it is considering
offering electricity from a coal powered plant at a lower price. the company received a study from a coal
producing company showing that customers would buy the cheaper electricity. is there any incentive for
the survey to be biased? - Answers yes, because the coal company may benefit from the results of the
survey
a lawn service provider in your area would like to introduce a new service to its customers. the company
put flyers on each of their customers' doors asking them to call in and say whether or not they would
use this new service. the service received 73 phone calls, 65 of which would use the service. which
sampling method was used? - Answers voluntary response
a magician flips a coin 8 times producing heads each time. is there statistical significance to say the coin
is somehow rigged? - Answers yes, because the results are unlikely to happen by chance
a study was made to find if the distance people lived from where they worked was affected by whether
or not they had college degrees. it was found without a college degree, a person traveled an average
distance 12. 3 mi to work. with a college degree, a person traveled 24.2 mi to work. are the results
practically significant? - Answers yes, because the distance for those with a degree is almost twice that
of those who do not
in a study of fast food restaurants, 120 restaurants started with an average price of $2.32 per item.
during a six month period the average price increased by $0.30. does this study have practial
significance? - Answers yes, because the increase has an impact on the customer
you flip a coin and get tails - Answers possible and likely
lightening strikes the same spot twice - Answers possible but very unlikely
, in a study, subjects were found using the method as follows: "we recruited study candidates from the
greater boston area using newspaper ads and tv publicity." which sampling method was used? - Answers
voluntary response
a recent poll contacted 230 people who own a car and live in california and asked whether or not they
were a homeowner. identify the population of this poll - Answers all people who live in california and
own a car
In a study of a weight loss program, 40 subjects lost a mean of 3.0 Ibs after 12 months. Does the weight
loss program have practical significance? - Answers no, because the mean weight loss of 3.0 lbs after
one year does not seem to justify the program
a lumberyard wanted to do a survey to see if its customers were interested in purchasing rope along
with lumber. what group should do the study so the bias is minimal? - Answers a university
while driving your car gets two flat tires at the same time - Answers possible but very unlikely
a study of a new medical procedure selected 27 candidates from a pool of 583 potential candidates.
what sampling method was used? - Answers random selection
a student picked three different points on a line, and he noticed that all three points were also on the
same circle - Answers impossible
you are the one-millionth customer in line - Answers possible but very unlikely
A study compared surgery and splinting for subjects suffering from carpal tunnel syndrome. It was found
that among 73 patients treated with surgery, there was a 92% success rate. Among 83 patients treated
with splints, there was a 72% success rate. Calculations using those results showed that if there really is
no difference in success rates between surgery and splints, then there is about 1 chance in 1000 of
getting success rates like the ones obtained in this study. Which statement cannot be said? - Answers
A small club wanted to see if its membership wanted to make an expansion to its dining hall. In order to
do this, the club held a meeting in which every member who attended got one vote. Which sampling
method was used? - Answers census
A bag contains 10 red marbles and 3 blue marbles. Susan picked two marbles from the bag without
replacing them, and she chose 2 red marbles. - Answers possible and likely
A foresting service conducted a survey to see if tree farms that planted hardwood trees were more
profitable over a 30-year period than tree farms that planted softwood trees. The results of this study
showed that hardwood trees had a 46% higher profit per acre. Are the results statistically significant? -
Answers yes. because planting hardwood trees have a higher profit per acre
One of Gregor Mendel's famous hybridization experiments with peas yielded 580 offspring with 152 of
those peas (or 26%) having yellow pods. According to Mendel's theory, 25% of the offspring peas should
have yellow pods. Do the results of the experiment differ from Mendel's claimed rate of 25% by an
