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Exam 3: Descriptive Statistics: Numerical Measures

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Question 1

Multiple Choice

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Exhibit 3-1 A researcher has collected the following sample data. -Refer to Exhibit 3-1. The mean is

A) 5
B) 6
C) 7
D) 8

E) B) and C)
F) All of the above

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Question 2

Multiple Choice

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The population variance can never be

A) zero
B) larger than the standard deviation
C) negative
D) all of these are correct

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

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Question 3

Multiple Choice

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Exhibit 3-1 A researcher has collected the following sample data. -Refer to Exhibit 3-1. The median is

The coefficient of variation indicates how large the standard deviation is relative to the

Excel's __________ function can be used to compute the population variance.

Angela Lopez, a golf instructor, is interested in investigating the relationship between a golfer's average driving distance and 18-hole score. She recently observed the performance of six golfers during one round of a tournament and measured, as accurately as possible, the distances (yards) of their drives and noted their final scores. She then computed each golfer's average drive distance for 18 holes. The results of her sample are shown below. Compute and interpret both the sample covariance and the sample correlation coefficient.

Paul, a freshman at a local college just completed 15 credit hours. His grade report is presented below. The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0. Compute Paul's semester grade point average.

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The standard deviation is

The amount of time that a sample of students spends watching television per day is given below. a.Compute the mean. b.Compute the median. c.Compute the standard deviation. d.Compute the 75th percentile.

A numerical measure computed from a sample, such as sample mean, is known as a

The sum of deviations of the individual data elements from their mean is

The measure of central location most often reported for annual income and property value data is the

For the following data Compute the following measures: a. The mean b. The variance c. The standard deviation d. The coefficient of variation e. The 25th percentile f. The median g. The 75th percentile

A graphical summary of data that is based on a five-number summary is a

If two groups of numbers have the same mean, then their

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

The value of the sum of the squared deviations from the mean, i.e., must always be

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

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

Which of the following descriptive statistics is not measured in the same units as the data?