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Exam 3: Descriptive Statistics: Numerical Measures

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Question 51

Multiple Choice

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The first quartile

A) contains at least one third of the data elements
B) is the same as the 25th percentile
C) is the same as the 50th percentile
D) is the same as the 75th percentile

E) A) and D)
F) C) and D)

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Question 52

Multiple Choice

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Exhibit 3-1 The following data show the number of hours worked by 200 statistics students. -Refer to Exhibit 3-1. The class width for this distribution

A) is 9
B) is 10
C) is 11
D) varies from class to class

E) B) and C)
F) A) and B)

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Question 53

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The value which has half of the observations above it and half the observations below it is called the

Exhibit 3-3 A researcher has collected the following sample data. The mean of the sample is 5. 3 5 12 3 2 -Refer to Exhibit 3-3. The interquartile range is

Compute the weighted mean for the following data.

A local university administers a comprehensive examination to the recipients of a B.S. degree in Business Administration. A sample of examinations are selected at random and scored. The results are shown below. For the above data, determine a.The mean b.The median c.The mode d.The standard deviation e.The coefficient of variation

Consider a sample with the following data values. Compute the Z scores for the above five observations.

The pth percentile is a value such that at least p percent of the observations are

In a five number summary, which of the following is not used for data summarization?

For the following frequency distribution (assume the data represent a population), a.Compute the mean. b.Compute the standard deviation.

A numerical measure of linear association between two variables is the

Exhibit 3-5 You are given the following frequency distribution. -Refer to Exhibit 3-5. The coefficient of variation is

Growth factors for the population of Atlanta in the past five years have been 1, 2, 3, 4 , and 5. The geometric mean is

Geometric mean is a measure of

The mean of a sample

In 2008, the average age of students at UTC was 22 with a standard deviation of 3.96. In 2009, the average age was 24 with a standard deviation of 4.08. In which year do the ages show a more dispersed distribution? Show your complete work and support your answer.

The numerical value of the variance

The following frequency distribution shows the time (in minutes) that a sample of students uses the computer terminals per day. a.Compute the mean. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

A group of students had dinner at a local restaurant. The total bill for the dinner was $414.70. Each student paid his/her equal share of the bill, which was $18.85. How many student's were at the dinner?

The nth root of the product of the n observations is