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Unformatted text preview: Revised 02/03/2010 2201_Quiz1A.docm EXST 2201
Quiz 1A
Name: Section: Score: Directions: This quiz will be available due on Moodle after the lectures on Chapter 02 have
been given. Mark your answers on this printout. When the quiz is available on
Moodle, record your answers in the Moodle quiz and submit them for grading.
You may take the quiz only once and you will have an hour and a half to
complete it, so be sure of your answers before you start the Moodle quiz.
1. Use the data in the table below to answer the following two matching questions:
Model
3 Series
5 Series
7 Series Body Style
Coupe
Sedan
Sedan Weight Number of Seats
2780
5
3450
5
4255
5 1A. Matching: In the blank below the description in the left column, write the
matching term from those listed in the box to the right.
In the table above,
Each column contains information for
a variable. a census. Each row contains information for
an individual. a variable. The information inside the body of the table is called
the data. an individual.
the data. 1B. Matching: In the blank below the variable name in the left column, write
the matching term from those listed in the box to the right.
Using the table above, identify the type of data in each column listed below:
Body Style
qualitative qualitative Weight
continuous discrete
continuous Number of Seats
discrete problematic Page 1 of 8 Revised 02/03/2010 2201_Quiz1A.docm 2. (Question 2 subparts below)
2A. The Gallup News Service conducted a survey of 1,004 adults where the
respondents were asked, “Do you have a great deal of concern regarding
global warming?” What type of study is this?
•
•
•
• Observational study.
Experimental study.
Situational sampling.
News study. 2B. A pharmaceutical company developed a drug meant to relieve cold
symptoms. The company selected 300 males in New York aged 2529
years old and randomly divided them into two groups. Group 1 was given
the new drug and Group 2 was given a placebo. After one week of
treatment, the percentage of each group that still had cold symptoms was
compared. What type of experimental design is this?
•
•
•
• Independent.
Dependent.
Triple blind.
Group study. 2C. Randomly choosing several of your friends to come on a trip with you
would be an example of what type of sampling?
•
•
•
• With discretion
Without replacement
With replacement
Without cluster Page 2 of 8 Revised 02/03/2010 2201_Quiz1A.docm 3. Researchers at the University of California wished to determine whether
“music cognition and cognitions pertaining to abstract operations such as
mathematical or spatial reasoning” were related. To test this question, 36
college students listened to Mozart for 10 minutes then were administered a
spatial reasoning test using the StanfordBinet intelligence test. The same
students later sat in a room and listened to silence for 10 minutes then were
tested again.
Matching: In the blank below the variable name in the left column, write the
matching term from those listed in the box to the right.
What type of experimental design is this?
Dependent 36 college students What are the experimental units?
36 college students Dependent What is the treatment?
Listening to Mozart and silence Listening to Mozart and silence What is the response variable?
Test scores Independent
StanfordBinet intelligence test
Test scores 4. A national study conducted by the Centers for Disease Control asked college
students, “How often do you wear a seatbelt when driving a car?” The
frequencies of their answers are shown below.
Response
Frequency
Do not drive
249
Never
118
Rarely
249
Sometimes
345
Most of the time
716
3,093
Always
Total
4,770
4A. What is the relative frequency of the category Never?
•
•
•
• 118
249
0.025
0.077 4B. What is the cumulative frequency of the category Rarely?
•
•
•
• 118
249
367
616
Page 3 of 8 Revised 02/03/2010 2201_Quiz1A.docm 5. The bar chart below shows the relative frequency of 60 million women, by
educational attainment, who gave birth to a child in 1998. (Note: the percents do
not total 100%) 5A. What percent of these women had an associate degree?
•
•
•
• 15%
12.5%
7.5%
5% 5B. How many women with a Master’s degree gave birth in 1998?
•
•
•
• 30 million
300 thousand
3 million
4.5 million Page 4 of 8 Revised 02/03/2010 2201_Quiz1A.docm 6. The following frequency histogram represents the IQ scores of a random
sample of seventh grade students. IQs are measured to the nearest whole
number. The frequency of each class is labeled above each rectangle. 6A. How many students were measured?
•
•
•
• 60
160
215
220 6B. What is the category width?
•
•
•
• 100
10
60
5 6C. What category had the highest frequency? (This is the mode.)
•
•
•
• 57
7080
100110
140150
Page 5 of 8 Revised 02/03/2010 2201_Quiz1A.docm 6D. What is the best description of this histogram?
•
•
•
• Uniform
Symmetric
Skewed left
Skewed right 7. For the stem and leaf plot shown below:
Stem
8
7
6
5
4 Leaves
238
011366
345889
22399
047 7A. How many leaves are there?
•
•
•
• 5
23
28
10 7B. What are the min and the max?
•
•
•
• 47, 88
4, 8
40, 82
40, 88 Page 6 of 8 Revised 02/03/2010 2201_Quiz1A.docm 8. The following data represent the flight time (in minutes) of a random sample
of seven flights between the same two cities.
282, 270, 260, 266, 257, 260, 267
8A. What is the mean flight time?
•
•
•
• 260
266
266.5
268.5 8B. What is the median flight time?
•
•
•
• 260
266
266.5
268.5 8C. What is the mode flight time?
•
•
•
• 260
266
266.5
268.5 8D. What is the range?
•
•
•
• 20
12
6
25 8E. Matching: In the blank below the statistical term in the left column, write
the correct number from those listed in the box to the right.
Sum of squares
426
Variance
71
Standard deviation
8.43 314
71
426
8.43 Page 7 of 8 Revised 02/03/2010 2201_Quiz1A.docm 8F. Which of the following described data sets has less spread: data set 1 with
standard deviation 3 or data set 2 with variance 9?
•
•
•
• Data set 1
Data set 2
They have the same spread.
The two cannot be compared. 9. This set of ranked data contains the red blood cell count for 20 randomlyselected dogs.
0.2 5.2 5.3 5.6 6.0 6.1 6.1 6.1 6.2 6.3
6.6 6.8 6.8 6.8 6.9 7.0 7.1 7.5 8.1 8.2
9A. What is the 40th percentile?
•
•
•
• 6.10
6.15
6.20
6.30 9B. What is the fivenumber summary?
•
•
•
• {0.2, 6.05, 6.45, 6.95, 8.2}
{0.2, 6.1, 6.2, 7.0, 8.2}
{0.2, 6.0, 6.2, 7.05, 8.2}
{8.2, 6.45, 0.2, 6.95, 6.05} 9C. What is the interquartile range?
•
•
•
• 0.90
8.00
1.05
0.50 Page 8 of 8 ...
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 Spring '08
 McKenna

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