Exam 1 FALL 2011 VERSION A Solutions

# Phone time frequency distribution table clas s class

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Phone Time Frequency Distribution Table CLAS S CLASS LIMITS FREQUENCY 1 0.4 and under 0.65 6 2 0.65 and under 0.9 9 3 0.9 and under 1.15 20 4 1.15 and under 1.4 12 5 1.4 and under 1.65 3 TOTAL 50 8. The relative frequency of the 4 th  class is: A. 0.240* B. 0.148 C. 0.465 D. 0.920 9. The cumulative relative frequency for the  2 nd  class  is _______________.

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10. What proportion of employees have phone time  0.9 hours? 11.  Which of the following statements is  FALSE ? Use the following Stem-leaf diagram to answer questions #12 through #14. The  following diagram shows a  sample of companies  and the number of days it took  them to incorporate. Ste m(10 ) Leaf     (unit = 1) 1 0 1 2 4 2 1 2 5 6 3 0 2 4 4 4 3 4 5 7 8 12.  How many companies are in the sample?
A.   4 B. 17* C. 14 D. 58 13. How many companies took more than 28 days to incorportate? 14. The range of the data above is: The following information is for Questions #15 through #22: As part of a research  project a student at UNT interviewed a random sample of  30 students  on the  UNT Campus concerning their monthly number of cell phone calls.  These data  are shown below.   There are not the same number of data points in each row

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