Chapter 2: Q. 49 (page 134)
Use the following information to answer the next three exercises: State whether the data are symmetrical, skewed to the left, or skewed to the right.
Short Answer
The data is symmetric.
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Chapter 2: Q. 49 (page 134)
Use the following information to answer the next three exercises: State whether the data are symmetrical, skewed to the left, or skewed to the right.
The data is symmetric.
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Use the following information to answer the next six exercises. Sixty-five randomly selected car salespersons were asked the number of cars they generally sell in one week. Fourteen people answered that they generally sell three cars; nineteen generally sell four cars; twelve generally sell five cars; nine generally sell six cars; eleven generally sell seven cars.
Interquartile range (IQR) = _____ – _____ = _____
Twenty-five randomly selected students were asked the number of movies they watched the previous week. The results are as follows:

a. Find the sample mean .
b. Find the approximate sample standard deviation, s.
In a survey, several people were asked how many years it has been since they purchased a mattress. The results are shown in Table

Three students were applying to the same graduate school. They came from schools with different grading systems. Which student had the best GPA when compared to other students at his school? Explain how you determined your answer.

Use the following information to answer the next nine exercises: The population parameters below describe the full-time equivalent number of students (FTES) each year at Lake Tahoe Community College from 1976–1977 through 2004–2005.
• μ = 1000 FTES
• median = 1,014 FTES
• σ = 474 FTES
• first quartile = 528.5 FTES
• third quartile = 1,447.5 FTES
• n = 29 years
What percent of the FTES were from 528.5 to 1447.5? How do you know?
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