INTRODUCTION TO STATISTICS
CHAPTER ONE TEST
data - CORRECT ANSWERS-collections of observations (measurement, genders, survey
responses)
statistics - CORRECT 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 - CORRECT ANSWERS-the complete collection of all measurements or data
that are being considered
census - CORRECT ANSWERS-the collection of data from every member of the
population
sample - CORRECT ANSWERS-sub-collection of members selected from a population
random selection - CORRECT 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? - CORRECT 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? - CORRECT
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? -
CORRECT 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? - CORRECT 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? - CORRECT
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? - CORRECT ANSWERS-yes, because the increase
has an impact on the customer
you flip a coin and get tails - CORRECT ANSWERS-possible and likely
lightening strikes the same spot twice - CORRECT 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? - CORRECT 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 - CORRECT
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? - CORRECT 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? - CORRECT ANSWERS-a university
while driving your car gets two flat tires at the same time - CORRECT 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? - CORRECT 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 - CORRECT ANSWERS-impossible
you are the one-millionth customer in line - CORRECT 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
CHAPTER ONE TEST
data - CORRECT ANSWERS-collections of observations (measurement, genders, survey
responses)
statistics - CORRECT 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 - CORRECT ANSWERS-the complete collection of all measurements or data
that are being considered
census - CORRECT ANSWERS-the collection of data from every member of the
population
sample - CORRECT ANSWERS-sub-collection of members selected from a population
random selection - CORRECT 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? - CORRECT 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? - CORRECT
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? -
CORRECT 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? - CORRECT 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? - CORRECT
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? - CORRECT ANSWERS-yes, because the increase
has an impact on the customer
you flip a coin and get tails - CORRECT ANSWERS-possible and likely
lightening strikes the same spot twice - CORRECT 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? - CORRECT 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 - CORRECT
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? - CORRECT 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? - CORRECT ANSWERS-a university
while driving your car gets two flat tires at the same time - CORRECT 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? - CORRECT 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 - CORRECT ANSWERS-impossible
you are the one-millionth customer in line - CORRECT 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
