Transcript Game #1 File

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Chapter
Two
Chapter
Three
Chapter
Four
Chapter
Five
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The stem-and-leaf diagram below gives the
distribution of the ages in years of 20 participants at
a family reunion. Which of the following statements
about the distribution is correct?
a) The mean is larger than the
median
b) The distribution is skewed to the
left
c) It makes the most sense to use the
mean and standard deviation as a
numerical summary of center and
spread
A
From March 1981 to February 1983, the number of
burglaries committed each month was recorded.
The mean number of burglaries per month for
months 13 to 24 is?
a) 2.5
b) 3.375
c) 2.83
C
You receive a fax with six bids (in millions of
dollars) 1.3, 1.9, 1.2, 2.2, 2.4, and x, where x is
some number that is too blurry to read. Without
knowing what x is, what can we say about the
median of this data set?
a) It is 1.9
b) It must be between 1.3 and 2.2
c) It could be any number between
1.2 and 2.4
B
A sample was taken of the salaries of employees at a
large company. The following are the salaries in
thousands of dollars. Suppose each employee in the
company receives a $3000 raise for next year.
Which of the following will then occur?
a) The sample standard deviation
will increase by $3000
b) The sample mean will remain
unchanged
c) The IQR will remain unchanged
C
According to the "1.5 x IQR" rule, how many
outliers are there in the data set 110, 144, 115, 123,
114, 118, 72, 156?
a) None
b) One
c) Two
B
Suppose that the distribution of scores on a certain
standardized exam is normal with a mean of 500 and
a standard deviation of 100. The third quartile of the
distribution is?
a) Could be anywhere between 400
and 600
b) Is greater than 500
c) Is less than 500
B
The weights of cockroaches living in a university
dorm follow a normal distribution with a mean of 80
grams and a standard deviation of 5 grams. The
percentage of cockroaches having weights between
72 and 88 grams must be?
a) Less than 68%
b) Between 68% and 95%
c) Between 95% and 99.7%
B
Scores on the ACT follow a normal distribution with
a mean of 18 and a standard deviation of 6. Lisa's
standardized score on the ACT was z = -0.7. What
was her actual score?
a) 4.2
b) 13.8
c) 22.2
B
The lifetime of a 2-volt nonrechargeable battery in
constant use has a normal distribution with a mean of
516 hours and a standard deviation of 20 hours. The
proportion of batteries with lifetimes exceeding 520
hours is approximately?
a) .2000
b) .5793
c) .4207
C
The lifetime of a 2-volt nonrechargeable battery in
constant use has a normal distribution with a mean of
516 hours and a standard deviation of 20 hours. Of
all batteries, 90% have lifetime shorter than?
a) 541.6 hours
b) 517.28 hours
c) 490.4 hours
A
Which of the following statements does not contain
a blunder?
a) There is a correlation of r = .54
between the position a football
player plays and his weight
b) The correlation between amount
of fertilizer and yield of tomatoes
was found to be r = .33
c) The correlation between the gas
mileage of a car and its weight is
r = -.71 gallon per pound
B
There is a strongly linear association between the
weight of a football player and the time in seconds it
takes for that player to run a 100-yard dash.
Knowing this, a reasonable value for the correlation
between weight and 100-yard dash time would be
a) r = .8
b) r = 0
c) r = -.8
A
Foresters use linear regression to predict the volume
of timber in a tree using easily measured quantities
such as diameter. Let y be the volume of timber in
cubic feet produced by a tree and let x be the tree's
diameter in feet. One set of paired data gives the
prediction equation
yˆ  60 x  30
The predicted volume of timber for a
tree of diameter 18 inches is?
a) 1050 cubic feet
b) 90 cubic feet
c) 60 cubic feet
C
Foresters use linear regression to predict the volume
of timber in a tree using easily measured quantities
such as diameter. Let y be the volume of timber in
cubic feet produced by a tree and let x be the tree's
diameter in feet. One set of paired data gives the
prediction equation
yˆ  60 x  30
The residual of a tree of diameter 2 feet
that yields 120 cubic feet of timber is
a) 30
b) -30
c) 90
A
Which of the following statements about the slope of
the least-squares regression line is true?
a) It has the same sign as the
correlation coefficient
b) The square of the slope equals the
proportion of the variation in the
response variable that is explained
by the explanatory variable
c) It is unitless
A
Suppose we classify 315 randomly selected college
students according to their general major field and
their self-described political viewpoint.
What percentage of all students
surveyed describe themselves as
moderates?
a) 28.9%
b) 36.8%
c) 34.3%
B
Suppose we classify 315 randomly selected college
students according to their general major field and
their self-described political viewpoint.
What percentage of all students
surveyed are conservatives majoring
in business?
a) 12.1%
b) 42.2%
c) 28.6%
A
Suppose we classify 315 randomly selected college
students according to their general major field and
their self-described political viewpoint.
What percentage of liberals surveyed
were humanities majors?
a) 44.4%
b) 35.2%
c) 28.9%
B
Radioactive material decays over time according to a
process that can be modeled by an exponential
function. Suppose that you are given 100 grams of a
radioactive substance and asked to observe its decay
over a period of 10 days. Each day, you measure the
number of grams remaining, so that at the end of the
study, you have a set of observations where x = the
number of days elapsed and y = the amount of the
substance remaining. After transforming the data
x
ˆ
you get y  (98.25).91885
Based on these results, how much material do you
predict will be left after two weeks?
a) 22 grams
b) 30 grams
c) 83 grams
B
Contender or Pretender?
a) Contender
b) Pretender
c) Only Mr. Quigley knows
C
A researcher in early childhood education believes
that kindergarten-age children are more receptive to
help from a female teacher than help from a male
teacher. From a list of kindergarten teachers in the
state, the researcher randomly samples four classes
with male teachers and four classes with female
teachers. The students in the classes are interviewed,
and a measure of how receptive the students in each
class are to help from the teacher is determined. This
study is an example of
a) An experiment
b) An observational study
c) A census
B
A study involving overweight, postmenopausal
women aged 50 to 75 randomly assigned equal
numbers of women to an exercise program (at least
45 minutes of moderate walking or riding an
exercise bike five times a week) and a stretching
program (15 to 30 minutes of stretching three times a
week, under the supervision of an exercise
physiologist). It was found that a higher percentage
of women in the exercise group reported improved
sleep than did women in the stretching group. This
study is an example of
a) An experiment
b) A double-blind experiment
c) A matched-pairs experiement
A
. An agricultural researcher wants to compare the
effect on yield of three different methods of growing
blueberries. To control for variables such as soil
condition and location, he plants 30 plots on each of
six different farms. On each farm, 10 of the 30 plots
are assigned to each of the three treatments (growing
methods). The researcher measures and compares the
marketable yield of blueberries produced by each
plot. Which of the following best describes the
design of this experiment?
a) A completely randomized design
b) A block design on farms
c) A block design on treatments
B
You want to know the opinions of American high
school teachers on the issue of establishing a
national proficiency test as a prerequisite for
graduation from high school. You obtain a list of all
high school teachers belonging to the National
Education Association (the country’s largest
teachers’ union) and mail a survey to a random
sample of 2500 teachers. In all, 1347 of the teachers
return the survey. Which of the following statements
about this situation is true?
a)
The sampling frame is the set of all high school teachers
who are members of the NEA.
b) The population is the set of all high school teachers
who are members of the NEA
c) The sample is the set of 2500 teachers to whom you
send the survey.
B
You would like to compare the level of mathematical
knowledge among 15-year-olds in the United States and
Japan. To do this, you plan to give a mathematics
achievement test to random samples of 1000 15-year-olds in
each of the two countries. To ensure that the samples will
include individuals from all different socioeconomic groups
and educational backgrounds, you will randomly select 200
students from low-income families, 400 students from
middle-income families, and 400 students from high-income
families in each country. The sampling procedure being used
here is
a) Simple Random sampling
b) Voluntary Response sampling
c) Stratified sampling
C