2201_Quiz1A

2201_Quiz1A - Revised 02/03/2010 2201_Quiz1A.docm EXST 2201...

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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 25-29 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 Stanford-Binet 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 Stanford-Binet 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 70-80 100-110 140-150 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 five-number 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 inter-quartile range? • • • • 0.90 8.00 1.05 0.50 Page 8 of 8 ...
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