Statistics

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|COLLEGE OF THE BAHAMAS |
|BUSINESS STATISTICS |
|FIRST INTERM EXAM |
|COURSE: STAT201 TIME: 2 Hours |
|DIRECTIONS: Answer questions (Q1 - Q9) and choose one bonus question MARKS: 110 pts |

Q1. The following is a stem-and-leaf display of the ages of full-time employees at a department store:

2. | 2 3 3 5 7 3. | 4 7 9 4. | 1 2 4 4 7 8 5. | 3 3 3 6. | 1 4 7. | 2

a. What are the ages of the employees?
b. What is the modal age?
c. Using a first class of “20-29”, prepare a frequency distribution showing frequency, cumulative frequency and relative frequency.
d. What is the class width?
(4, 1, 6, 1 pts each)
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Q2. The following are starting salaries for 10 recent graduates from XYZ University:

$36,500 $28,900 $25,000 $27,000 $31,600 $42,000 $26,500 $22,100 $33,400 $24,800 a) Compute:

i) the mean ii) the median iii) the range iv) the IQR v) Percentile 58 (1, 1, 1, 3, 3 pts)

b) Comment on the probable skewness of the distribution. (3 pts)