Posted: March 4th, 2014
C3
1. To get the best deal on a CD player, Tom called eight appliance stores and asked the cost of a specific model. The prices he was quoted are listed below:
$ 218Â Â $ 125Â Â $ 381Â Â $ 187Â Â $ 231Â Â $ 213Â Â $ 309Â Â $ 230Â Â Â Â Â Â Â Find the Standard deviation
2. When investigating times required for drive-through service, the following results (in seconds) were obtained. Find the range, variance, and standard deviation for each of the two samples, then compare the two sets of results.
Wendy’s        110 113 133  198 124 120 154 110
MacDonald’s    105 116 131 176 118 110 135 137
3. A company had 80 employees whose salaries are summarized in the frequency distribution below. Find the standard deviation. Find the standard deviation of the data summarized in the given frequency distribution.
Salary                Number of Employees
5,001 -10,000Â Â Â Â 11
10,001 – 15,000Â Â Â Â 13
15,001 – 20,000Â Â Â Â 20
20,001 – 25,000Â Â Â Â 17
25,001 – 30,000Â Â Â Â 13
4. The heights of a group of professional basketball players are summarized in the frequency distribution below. Find the standard deviation.
Height (in.)Â Â Â Frequency
70-71Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 4
72-73Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 9
74-75Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 18
76-77Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 11
78-79Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 9
80-81Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 4
82-83Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 1
Case Assignment Expectations:
Use information from the modular background readings as well as any good quality resource you can find. Please cite all sources and provide a reference list at the end of your paper.
The following items will be assessed in particular:
- Your ability to describe the information provided by the Standard Deviation.
- Your ability to use the Standard Deviation to calculate the percentage of occurrence of a variable either above or below a particular value.
- Your ability to describe a normal distribution as evidenced by a bell shaped curve.
- Your ability to prepare a distribution chart from a set of data.
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