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Test Bank For Practice of Statistics in the Life Sciences, Digital Update 4th Edition by Brigitte Baldi; David S. Moore Chapter 1-28R344,84
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1. Some variables that were recorded while studying diets of sharks are given below.
Which of these variables is not quantitative?
A) Amount of food eaten in a day by the shark being observed
B) Age of the shark being observed
C) Type of shark being observed
D) Length of the shark being observed
2. A survey is conducted among students taking a statistics class. Several variables are
measured in the survey. Which of the variables listed below is qualitative?
A) Number of credit hours taken during the quarter
B) Gender
C) Parents' annual income
D) High school GPA
3. Stream quality is based on the levels of many variables, including those listed below.
Which of these variables is quantitative?
A) Amount of phosphorus
B) Number of distinct species present
C) Amount of dissolved oxygen
D) All of these answers are correct.
4. During winter, red foxes hunt small rodents by jumping into thick snow cover.
Researchers report that a hunting trip lasts, on average, 19 minutes and involves, on
average, 7 jumps. In a surprising finding, they report that 79% of successful jumps are
made in the northeast direction. Which of the following statements about these results is
TRUE?
A) The three variables reported are all quantitative.
B) The three variables reported are all categorical.
C) Two of variables reported are quantitative and one is categorical.
D) Two of variables reported are categorical and one is quantitative.
5. A survey records many variables of interest to the researchers conducting the survey.
The following variables are some of the variables collected in a survey conducted by the
USDA. Which of these variables is categorical?
A) Type of grain grown
B) Number of acres owned
C) Total farm income, before taxes, in 1993
D) Number of children younger than age 12 on the farm
Page 1
,6. The EPA sends out a survey to learn about people's water-usage habits. Some of the
variables to be analyzed are responses to the following questions. Which of these
questions leads to categorical responses?
A) How many times a day do you take a shower?
B) Do you leave the water running when brushing your teeth?
C) How many times a week do you water your lawn?
D) None of these answers is correct.
7. Which of the following is a discrete variable?
A) Number of different toxins present in a fish
B) Length of a fish
C) Weight of a fish
D) All of these answers are correct.
8. Some variables were recorded while surveying plants in a wildlife area. Which of the
following variables is continuous?
A) Count of petals per flower
B) Count of flowers per plant
C) Plant height in centimeters
D) Plant species
9. Some variables were recorded while surveying plants in a wildlife area. Which of the
following variables is discrete?
A) Count of petals per flower
B) Whether the plant grows under the shade of another plant
C) Plant height in centimeters
D) Plant species
Page 2
,10. Here are records of eye color for a random sample of 103 individuals:
Eye color Number of
individuals
Blue 21
Green 7
Hazel 23
Brown 47
Other 5
This data set is best represented graphically in a
A) Histogram.
B) Stemplot.
C) Scatterplot.
D) Boxplot.
E) Pie chart.
11. During winter, red foxes hunt small rodents by jumping into thick snow cover.
Researchers report that a hunting trip lasts, on average, 19 minutes and involves, on
average, 7 jumps. In a surprising finding, they report that 79% of all successful jumps
are made in the northeast direction. Three variables are mentioned in this report. What is
the best description of the first variable mentioned?
A) Quantitative and discrete
B) Quantitative and continuous
C) Categorical
D) Ordinal
12. During winter, red foxes hunt small rodents by jumping into thick snow cover.
Researchers report that a hunting trip lasts, on average, 19 minutes and involves, on
average, 7 jumps. In a surprising finding, they report that 79% of all successful jumps
are made in the northeast direction. Three variables are mentioned in this report. What is
the best description of the second variable mentioned?
A) Quantitative and discrete
B) Quantitative and continuous
C) Categorical
D) Ordinal
Page 3
, 13. During winter, red foxes hunt small rodents by jumping into thick snow cover.
Researchers report that a hunting trip lasts, on average, 19 minutes and involves, on
average, 7 jumps. In a surprising finding, they report that 79% of all successful jumps
are made in the northeast direction. Three variables are mentioned in this report. What is
the best description of the third variable mentioned?
A) Quantitative and discrete
B) Quantitative and continuous
C) Categorical
D) Ordinal
14. What is important to do when drawing a histogram?
A) Use no more than four class intervals, except for categorical variables.
B) Leave gaps between the bars so the reader can easily distinguish between the class
intervals.
C) Label the vertical axis, so the reader can determine the counts or percent in each
class interval.
D) Make certain the mean and median are contained in the same class interval, so the
correct type of skewness can be identified.
15. For a biology lab course containing 10 students, the maximum point total for the quarter
was 200. The point totals for the 10 students are given in the following stemplot:
11 6 8
12 1 4 8
13 3 7
14 2 6
15
16
17 9
To which type of graph is this stemplot most similar?
A) A histogram with class intervals 110 score < 120, 120 score < 130, . . .
B) a time plot of the data with the observations taken in increasing order
C) A boxplot of the data
D) Reporting the five-point summary for the data, with the mean
Page 4
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