BRM Your Path to Success:244 Essential Exam Questions for Serious Students |Success Guaranteed|27 Pages
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: the mean and standard deviation are the natural measures of center and spread for an important kind of symmetric distribution, called the _____ - ️️Normal distribution
. The median is the ________, the value that separates the smaller half of the observations from the larger half - ️️mid...
BRM Your Path to Success:244 Essential
Exam Questions for Serious Students
: the mean and standard deviation are the natural measures of center and spread for an important kind
of symmetric distribution, called the _____ - ✔ ✔ Normal distribution
. The median is the ________, the value that separates the smaller half of the observations from the
larger half - ✔ ✔ midpoint
"_______?" is the first question you should ask when someone throws a number at you - ✔ ✔
Where do the data come from
• A specific Normal curve is completely described by
giving its mean and its standard deviation. - ✔ ✔
A ___ is a long-term upward or downward movement over time - ✔ ✔ trend
A ______ is a sample survey that attempts to include the entire population in the sample - ✔ ✔
census
A _______ can produce more accurate data than a census. - ✔ ✔ sample
A boxplot is a graph of the five-number summary. _______ - ✔ ✔ • A central box spans the quartiles.
• A line in the box marks the median. • Lines extend from the box out to the smallest and largest
observations.
A categorical variable places an individual into one of _____ - ✔ ✔ several groups or categories.
A density curve displays the distribution of
A. a data set.B. the mean and median.C. what the population shape should be - ✔ ✔ C. what the
population shape should be
A distribution is skewed to the right if the right side of the histogram (containing the half of the
observations with larger values) extends ______ - ✔ ✔ much farther out than the left side.
A distribution is symmetric if the right and left sides of the histogram are ______ - ✔ ✔
approximately mirror images of each other
A group studying traffic on a recreational lake records location, time of day (morning, afternoon,
evening), and numbers of boats. Which of the following variables are of the categorical type?
,A. Number of boatsB. Time of day (morning, midday, afternoon, evening)C. LocationD. (A) and (B)E. (B)
and (C) - ✔ ✔ (B) and (C)
A histogram is used to display data from what type of variable?
A. CategoricalB. Quantitative - ✔ ✔ B. Quantitative
A line graph of a quantitative variable, plots each observation _____ - ✔ ✔ against the time at which
it was measured.
A pattern that repeats itself at known regular intervals of time is called _______. Many series of regular
measurements over time are _______. That is, the expected seasonal variation is removed before the
data are published. - ✔ ✔ seasonal variation
seasonally adjusted
A pictogram is generally a bad choice for a graphical display because
A. a pie chart is always better.B. it is difficult to find pictures.C. it is difficult to avoid distortion.D. a line
graph plots the numbers more clearly. - ✔ ✔ it is difficult to avoid distortion
A picture will help you detect _____ and ____
Always start with a ___ of your data! - ✔ ✔ skewness and outliers
graph
A positive standard score indicates the observation is
above the mean.
A negative standard score indicates the observation is
below the mean. - ✔ ✔
A probability model can be described by A. assigning probabilities to each individual outcome.B. the
margin of error.C. a density curve.D. Both (A) and (B).E. Both (A) and (C). (correct) - ✔ ✔
A quantitative variable takes numerical values for which arithmetic operations such as adding and
averaging make sense. A quantitative variable is also sometimes referred to as a ___ variable - ✔ ✔
numerical
A relative frequency histogram is also a better choice if one wants to make comparisons between _____
- ✔ ✔ two distributions.
A response is a variable that measures an outcome or ______ - ✔ ✔ result of a study.
, A sample is the part of the population from which we actually collect information and is used to draw
_______ - ✔ ✔ conclusions about the whole.
A side-by-side bar graph is useful for making ____ - ✔ ✔ comparisons
A simple and effective way to describe center and spread is to give the _____ and the ____ - ✔ ✔
median
quartiles
A simple and effective way to describe center and variability is to give the _____.
The median is the ____
If we choose the median (the midpoint) to describe center, the quartiles (in particular, the difference
between the quartiles) provide natural descriptions of _____ - ✔ ✔ median and the quartiles
midpoint
variability
A situation in which one would choose to use a histogram rather than a stemplot would be
A. for a very small data set.B. for a very large data set.C. for a skewed data set.D. if we want to hide
certain features of the shape of the distribution. - ✔ ✔ B. for a very large data set
A situation in which one would choose to use a relative frequency histogram rather than a frequency
histogram would be
A. for a very small data set.B. for a very large data set.C. for a skewed data set.D. if we want to hide
certain features of the shape of the distribution. - ✔ ✔ B. for a very large data set
A stemplot is
A. similar to a histogram turned on its side.B. similar to a bar graph turned on its side.C. used for a
skewed data set.D. a line graph turned vertically. - ✔ ✔ A. similar to a histogram turned on its side
A stemplot looks like a histogram turned on ____. The stemplot in Figure 11.6 is just like the histogram
in Figure 11.1 because the classes chosen for the histogram are the same as the stems in the stemplot -
✔ ✔ end
A student wants to display the distribution of eye color in her statistics class. She could use
A. a pie chart.B. a bar graph.C. a line graph.D. Both a and b.E. All of the above. - ✔ ✔ D. Both a and b
A variable is any _______ ex.) - ✔ ✔ characteristic of an individual
ex.) major, grade, # of points
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