2.4.1 STA-O Assessment 2
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1 2.4.1 STA-O Assessment 2 Work all the problems and determine the correct answers. When you have completed the assessment, open the Assessment 2 activity and input your responses into the online grading system. 1. Which of the following does not need to be done when constructing a frequency distribution? A) select the number of classes desired B) find the range C) make the class width an even number D) use classes that are mutually exclusive 2. What are the boundaries of the class 12-16? A) 11.5 and 16.5 B) 10 and 18 C) 12 and 16 D) 4 3. Which of the following pairs of class limits would be appropriate for grouping the numbers 12, 15, 10, and 17? A) 9-13 and B) and C) and D) and Find the class with the least number of data values. A) B) C) D) Page 1
2 5. Which of the following could be a cumulative frequency graph? A) B) C) D) Page 2
3 6. How many values are in the data set whose histogram is shown below? A) 6 B) 22 C) 76 D) An automobile dealer wants to construct a pie graph to represent types of cars sold in July. He sold 72 cars, 16 of which were convertibles. How many degrees should be used for the convertibles section? A) 60 B) 80 C) 100 D) A Pareto chart does not have which of the following properties? A) frequencies displayed by the heights of vertical bars B) frequencies arranged from highest to lowest C) quantitative variable on the horizontal axis D) classes of data are categorical 9. A weatherman records the amount of rain that fell in Portland, Oregon each day for a year. What type of graph should he use to show how rainfall changes during the year? A) pie graph B) pictograph C) time series graph D) Pareto chart Page 3
4 10. The two variables in a scatter plot are called the A) independent variable and dependent variable. B) relative frequency and relative proportion. C) spread and pattern. D) lines and points. 11. Determine the type of relationship shown in the figure below. A) positive B) negative C) multiple D) There is no relationship. 12. In a unimodal, symmetrical distribution as shown in the figure below, A) the mean is the same as the median, but the mode can be different. B) the mean, the median, and the mode are the same. C) the median and the mode are the same, but the mean can be different. D) the mean, the median, and the mode are different. Page 4
5 13. A student received the following grades last semester. Find the student's semester grade point average. Course Credits Grade/Points Statistics 4 A / 4.0 Physics 5 A / 4.0 Sociology 3 B / 3.0 Literature 2 B / 3.0 Tennis 1 D / 1.0 A) 3.00 B) 3.47 C) 3.24 D) A characteristic or measure obtained by using all the data values for a specific population is called a. A) variable B) mode C) statistic D) parameter 15. Given that the variance for a data set is 1.20, what is the standard deviation? A) 1.10 B) 1.44 C) 1.20 D) If a data set has 25 values and a standard deviation 7.4, then the variance is. A) 54.8 B) 1.5 C) 11.0 D) Given that the mean of a set of data is 25 and the standard deviation is 3, what is the coefficient of variation? A) 0.12 B) 12% C) 8.33 D) 833% Page 5
6 18. A baseball player has a batting average of each week of the season, with a standard deviation of What is the z score when he bats one week? A) B) C) D) Indicate which student has the higher z score. Art Major Theater Major A) The art major has a higher score than the theater major. B) The theater major has a higher score than the art major. C) Both students have the same score. D) Neither student received a positive score; therefore, the higher score cannot be determined. 20. Using the table below, what grade would a student who ranked in the 50th percentile receive. Grade Class Boundaries Frequency A B C D F A) B B) C C) D D) F 21. The size of the box in a boxplot shows the of the data set. A) difference between the mean and the median B) variance C) skewness D) interquartile range Page 6
7 22. Given the following boxplot where m is the median value, what statement could be made about the distribution of the data? A) The distribution is approximately symmetric. B) The distribution is positively skewed. C) The distribution is negatively skewed. D) The data are nominal and consequently can not be identified as symmetric or skewed. 23. Identify the five-number summary of the following data set. 7, 11, 21, 28, 32, 33, 37, 43. A) 7, 16, 30, 35, 43 B) 7, 21, 30, 33, 43 C) 7, 11, 28, 33, 43 D) 7, 21, 26.5, 33, 43 Page 7
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