ANIMSCI 2260 Data Analysis Exam Study Set
A plant scientist wants to determine the average yield (in bushels per acre) of
brand X corn in Ohio. Five thousand Ohio corn fields are planted using brand X.
The plant scientist is able to obtain data for the yields of 500 of these 5,000
fields. The average yield of these 500 fields planted to brand X is 175 bushels
per acre. What does the value of 175 bushels per acre represent? - ANSWER A
statistic
A ____________ is a collection or set of data that describes a phenomenon of
interest to us. - ANSWER population
USA Today reported the results of a study that suggests frequently heading the
ball in soccer lowers players' IQs. A psychologist tested 60 male soccer players
ages 14 to 29 who played soccer up to five times per week. Players who
averaged 10 or more headers per game had an average IQ of 103, whereas
players who headed the ball one or fewer times per game had an average IQ of
112. The average IQ of 112 represents: - ANSWER A stastistic
Starting salary and GPA of students who graduate from OSU are examples of
____________ data. - ANSWER quantitative data
The branch of statistics that uses numerical and graphical methods to look for
patterns in a data set, to summarize the information contained in a data set, and
to present the information in a convenient form is called - ANSWER descriptive
statistics
What are the 3 measures of central tendency? - ANSWER Mean, median, and
mode
A farmer weighs his calves on the day they are weaned. The weight of the
lightest calf is 300 lb and the weight of the heaviest calf is 650 lb. Based on this
information, which measure of variation could be calculated? - ANSWER range
The symbol for the variance of a sample is _______. - ANSWER s2
The symbol for the variance of a population is _______. - ANSWER σ2
The weights of 6 dogs (in pounds) are as follows: 30 32 28 42 40 44
Find the median. - ANSWER 36
Health care issues are receiving a greal deal of attention in both the academic
and political arenas. A sociologist recently conducted a survey of senior citizens
,whose net worth is too high to quality for Medicaid, but who have no private
health insurance. The ages (in years) of 9 uninsured senior citizens were as
follows:
Senior CitizenAge165270364484574672787879980
Find the median age of these 9 senior citizens. - ANSWER 74 years
The birth weights in pounds of 7 calves were as follows:
CalfWeight168270364490574672787
Find the median birth weight of these 7 calves. - ANSWER 72 lb
The grades of 8 students on an exam were as follows:
StudentGrade166270364488574672787879
Find the median grade of these 8 students. - ANSWER 73
The grades of 8 students on an exam were as follows:
StudentGrade166270364488574672787879
Find the range for the grades of these 8 students. - ANSWER 24
A severe drought has affected several western states in recent years. A
Christmas tree farmer is worried about the drought's effect on the size of his
trees. To determine whether the growth of his trees has been reduced by the
drought, the farmer decides to take a sample of the heights of 6 trees and
obtains the following results (recorded in inches):
TreeHeight160257362469546654
Find the variance of the heights of this sample of 6 trees. - ANSWER 60.4
inches2
The birth weights of a sample of 8 calves (in pounds) are as follows:
66 70 64 88 74 72 87 79
Calculate the variance of this sample of 8 calf birth weights. - ANSWER 80.86
pounds squared
According to Chebyshev's Rule, we expect ________ % of the observations to fall
within two standard deviations of the mean, if the data do not have a symmetric
and mound shaped distribution. - ANSWER at least 75%
The population mean and population variance are examples of statistics. -
ANSWER false
The weights of 25 lambs (in pounds) in a flock of sheep are as follows:
68 73 66 76 86 74 61 89 65 90
69 92 76 62 81 63 68 81 70 73 60 87 75 64 82
Construct a stem-and-leaf display using the first digit as the stem and the
second digit as the leaf. Based on the stem-and-leaf display, the lower quartile
for this set of weights is __________ lb. - ANSWER 66 lb
,The birth weights of 21 calves (in pounds) are as follows:
87 76 96 77 94 92 88 85 66 89
79 95 50 91 83 88 82 58 55 69 97
Construct a stem-and-leaf display using the first digit as the stem and the
second digit as the leaf. Based on the stem-and-leaf display, the lower quartile
for this set of birth weights is __________ lb. - ANSWER 76 lb
A random sample of sale prices of homes in Columbus, Ohio yielded the
following summary information:
Median = $125,000 Lower quartile = $82,000 Upper quartile = $168,000
Lowest price = $46,000 Highest price = $276,000
Construct a box plot for these data. Based on this box plot, is the lowest selling
price of $46,000 a suspect or highly suspect outlier? - ANSWER The sale price of
$46,000 is not a suspect or highly suspect outlier, because it falls inside the
inner fences.
Listed in the table below are the weights of 18 dogs (in pounds).
30.122.014.616.412.02.422.210.015.112.66.84.12.51.433.416.88.13.2
Construct a stem and leaf display (using the numbers to the left of the decimal
point as the stems and the numbers to the right of the decimal point as the
leaves) and then construct a box plot using the weights of these 18 dogs. The
lower outer fence, lower inner fence, upper inner fence, and upper outer fence
are _______, _______, _______, and _______ lb, respectively. - ANSWER -34.0, -
14.95, 35.85, and 54.9
At the U.S. Open Tennis Championship a statistician keeps track of every serve
that a particular player hits during the tournament. The statistician reports that
the mean speed of serves by this player was 100 mph and the standard deviation
of his serves was 10 mph. Three of the serves were clocked at 65, 110, and 120
mph. Using the z-score approach for detecting outliers, which of these three
serves represent outliers in the distribution of the speed of this player's serves?
- ANSWER Only 65 mph is an outlier.
A study of binge alcohol drinking by college students was published in the
American Journal of Public Health. Suppose an experiment consists of randomly
selecting one of the undergraduate students who participated in the study.
Consider the following events:
A: {The student is a binge drinker}
B: {The student is a male}
C: {The student lives in a coed dorm}
Describe the following event in terms of unions, intersections, or complements:
The student is not a binge drinker. - ANSWER Ac
Sandoz, a pharmaceutical firm, reports that kidney transplant patients who
receive the drug cyclosporine have an 80% chance of surviving the first year.
Suppose a hospital performs 4 kidney transplants and all 4 patients receive
, cyclosporine. Assuming that one patient's survival is independent of another's,
what is the probability that all 4 patients will be alive at the end of 1 year? -
ANSWER 0.4096
If we roll a single die, the sample points are a 1, 2, 3, 4, 5, or 6. Consider the
following two events:
Event A: toss an even number
Event B: toss a number less than or equal to 2
List the sample points that would be included in the union of events A and B. -
ANSWER {1, 2, 4, 6}
A state energy agency mailed questionnaires on energy conservation to 1,000
homeowners in Columbus. Suppose an experiment consists of randomly
selecting one of the returned questionnaires.
Consider the events:
Event A: the home is constructed of brick
Event B: the home is more than 30 years old
Event C: the home is heated with oil
A home that is constructed of brick or is heated with oil would be represented by
which one of the following? - ANSWER A υ C
Investing in the stock market involves a certain amount of risk. Suppose that
there is a 20% chance that a risky stock investment will end up in a total loss of
your investment. Because the rewards are so great if your investment is
successful, you decide to invest in three independent risky stocks, each of
which has the same 20% chance of total loss of your investment. Find the
probability that all three stocks will result in total loss of your investment. -
ANSWER 0.008
The sample mean and sample standard deviation are examples of parameters. -
ANSWER false
Assume that the mean score on an IQ test is a 100 and that the standard
deviation of the scores is 15. The highest IQ score among the people taking the
test was a 160. Calculate the z-score for the person with the highest score of
160. Based on the z-score, is this score of 160 an outlier? Why or why not? -
ANSWER The z-score is 4.0. Therefore, the IQ score of 160 is an outlier, because
4.0 is greater than 3.0.
A random sample of sale prices of homes in Columbus, Ohio yielded the
following summary information:
Median = $125,000 Lower quartile = $82,000 Upper quartile = $168,000
Lowest price = $46,000 Highest price = $276,000
Construct a box plot for these data. Based on this box plot, is the lowest selling
price of $46,000 a suspect or highly suspect outlier? - ANSWER The sale price of
A plant scientist wants to determine the average yield (in bushels per acre) of
brand X corn in Ohio. Five thousand Ohio corn fields are planted using brand X.
The plant scientist is able to obtain data for the yields of 500 of these 5,000
fields. The average yield of these 500 fields planted to brand X is 175 bushels
per acre. What does the value of 175 bushels per acre represent? - ANSWER A
statistic
A ____________ is a collection or set of data that describes a phenomenon of
interest to us. - ANSWER population
USA Today reported the results of a study that suggests frequently heading the
ball in soccer lowers players' IQs. A psychologist tested 60 male soccer players
ages 14 to 29 who played soccer up to five times per week. Players who
averaged 10 or more headers per game had an average IQ of 103, whereas
players who headed the ball one or fewer times per game had an average IQ of
112. The average IQ of 112 represents: - ANSWER A stastistic
Starting salary and GPA of students who graduate from OSU are examples of
____________ data. - ANSWER quantitative data
The branch of statistics that uses numerical and graphical methods to look for
patterns in a data set, to summarize the information contained in a data set, and
to present the information in a convenient form is called - ANSWER descriptive
statistics
What are the 3 measures of central tendency? - ANSWER Mean, median, and
mode
A farmer weighs his calves on the day they are weaned. The weight of the
lightest calf is 300 lb and the weight of the heaviest calf is 650 lb. Based on this
information, which measure of variation could be calculated? - ANSWER range
The symbol for the variance of a sample is _______. - ANSWER s2
The symbol for the variance of a population is _______. - ANSWER σ2
The weights of 6 dogs (in pounds) are as follows: 30 32 28 42 40 44
Find the median. - ANSWER 36
Health care issues are receiving a greal deal of attention in both the academic
and political arenas. A sociologist recently conducted a survey of senior citizens
,whose net worth is too high to quality for Medicaid, but who have no private
health insurance. The ages (in years) of 9 uninsured senior citizens were as
follows:
Senior CitizenAge165270364484574672787879980
Find the median age of these 9 senior citizens. - ANSWER 74 years
The birth weights in pounds of 7 calves were as follows:
CalfWeight168270364490574672787
Find the median birth weight of these 7 calves. - ANSWER 72 lb
The grades of 8 students on an exam were as follows:
StudentGrade166270364488574672787879
Find the median grade of these 8 students. - ANSWER 73
The grades of 8 students on an exam were as follows:
StudentGrade166270364488574672787879
Find the range for the grades of these 8 students. - ANSWER 24
A severe drought has affected several western states in recent years. A
Christmas tree farmer is worried about the drought's effect on the size of his
trees. To determine whether the growth of his trees has been reduced by the
drought, the farmer decides to take a sample of the heights of 6 trees and
obtains the following results (recorded in inches):
TreeHeight160257362469546654
Find the variance of the heights of this sample of 6 trees. - ANSWER 60.4
inches2
The birth weights of a sample of 8 calves (in pounds) are as follows:
66 70 64 88 74 72 87 79
Calculate the variance of this sample of 8 calf birth weights. - ANSWER 80.86
pounds squared
According to Chebyshev's Rule, we expect ________ % of the observations to fall
within two standard deviations of the mean, if the data do not have a symmetric
and mound shaped distribution. - ANSWER at least 75%
The population mean and population variance are examples of statistics. -
ANSWER false
The weights of 25 lambs (in pounds) in a flock of sheep are as follows:
68 73 66 76 86 74 61 89 65 90
69 92 76 62 81 63 68 81 70 73 60 87 75 64 82
Construct a stem-and-leaf display using the first digit as the stem and the
second digit as the leaf. Based on the stem-and-leaf display, the lower quartile
for this set of weights is __________ lb. - ANSWER 66 lb
,The birth weights of 21 calves (in pounds) are as follows:
87 76 96 77 94 92 88 85 66 89
79 95 50 91 83 88 82 58 55 69 97
Construct a stem-and-leaf display using the first digit as the stem and the
second digit as the leaf. Based on the stem-and-leaf display, the lower quartile
for this set of birth weights is __________ lb. - ANSWER 76 lb
A random sample of sale prices of homes in Columbus, Ohio yielded the
following summary information:
Median = $125,000 Lower quartile = $82,000 Upper quartile = $168,000
Lowest price = $46,000 Highest price = $276,000
Construct a box plot for these data. Based on this box plot, is the lowest selling
price of $46,000 a suspect or highly suspect outlier? - ANSWER The sale price of
$46,000 is not a suspect or highly suspect outlier, because it falls inside the
inner fences.
Listed in the table below are the weights of 18 dogs (in pounds).
30.122.014.616.412.02.422.210.015.112.66.84.12.51.433.416.88.13.2
Construct a stem and leaf display (using the numbers to the left of the decimal
point as the stems and the numbers to the right of the decimal point as the
leaves) and then construct a box plot using the weights of these 18 dogs. The
lower outer fence, lower inner fence, upper inner fence, and upper outer fence
are _______, _______, _______, and _______ lb, respectively. - ANSWER -34.0, -
14.95, 35.85, and 54.9
At the U.S. Open Tennis Championship a statistician keeps track of every serve
that a particular player hits during the tournament. The statistician reports that
the mean speed of serves by this player was 100 mph and the standard deviation
of his serves was 10 mph. Three of the serves were clocked at 65, 110, and 120
mph. Using the z-score approach for detecting outliers, which of these three
serves represent outliers in the distribution of the speed of this player's serves?
- ANSWER Only 65 mph is an outlier.
A study of binge alcohol drinking by college students was published in the
American Journal of Public Health. Suppose an experiment consists of randomly
selecting one of the undergraduate students who participated in the study.
Consider the following events:
A: {The student is a binge drinker}
B: {The student is a male}
C: {The student lives in a coed dorm}
Describe the following event in terms of unions, intersections, or complements:
The student is not a binge drinker. - ANSWER Ac
Sandoz, a pharmaceutical firm, reports that kidney transplant patients who
receive the drug cyclosporine have an 80% chance of surviving the first year.
Suppose a hospital performs 4 kidney transplants and all 4 patients receive
, cyclosporine. Assuming that one patient's survival is independent of another's,
what is the probability that all 4 patients will be alive at the end of 1 year? -
ANSWER 0.4096
If we roll a single die, the sample points are a 1, 2, 3, 4, 5, or 6. Consider the
following two events:
Event A: toss an even number
Event B: toss a number less than or equal to 2
List the sample points that would be included in the union of events A and B. -
ANSWER {1, 2, 4, 6}
A state energy agency mailed questionnaires on energy conservation to 1,000
homeowners in Columbus. Suppose an experiment consists of randomly
selecting one of the returned questionnaires.
Consider the events:
Event A: the home is constructed of brick
Event B: the home is more than 30 years old
Event C: the home is heated with oil
A home that is constructed of brick or is heated with oil would be represented by
which one of the following? - ANSWER A υ C
Investing in the stock market involves a certain amount of risk. Suppose that
there is a 20% chance that a risky stock investment will end up in a total loss of
your investment. Because the rewards are so great if your investment is
successful, you decide to invest in three independent risky stocks, each of
which has the same 20% chance of total loss of your investment. Find the
probability that all three stocks will result in total loss of your investment. -
ANSWER 0.008
The sample mean and sample standard deviation are examples of parameters. -
ANSWER false
Assume that the mean score on an IQ test is a 100 and that the standard
deviation of the scores is 15. The highest IQ score among the people taking the
test was a 160. Calculate the z-score for the person with the highest score of
160. Based on the z-score, is this score of 160 an outlier? Why or why not? -
ANSWER The z-score is 4.0. Therefore, the IQ score of 160 is an outlier, because
4.0 is greater than 3.0.
A random sample of sale prices of homes in Columbus, Ohio yielded the
following summary information:
Median = $125,000 Lower quartile = $82,000 Upper quartile = $168,000
Lowest price = $46,000 Highest price = $276,000
Construct a box plot for these data. Based on this box plot, is the lowest selling
price of $46,000 a suspect or highly suspect outlier? - ANSWER The sale price of
