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Exam 4: Central Tendency and Variability

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Question 51

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The _____ is the difference between the lowest and highest scores in the distribution.

A) standard deviation
B) range
C) variance
D) outlier

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

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Question 52

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The range is more susceptible to the influence of outliers than other measures of variability.

A) True
B) False

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Question 53

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Measures of central tendency and variability are calculated to describe the nature of charitable giving each year.These figures are computed for the "average" American citizen.Which of these is a possible value for the variance in dollars given?

The concept of variability is best described as:

The mean is the measure of central tendency that conveys the mathematical center of the data.

Six students from a psychology class reported the number of hours of television they watched per week.Here are their data: 18, 12, 15, 14, 13, 16.What is the mean number of hours of television watched per week for this sample of six students?

It is easier to distort and lie with the mean than with the median.

Sixteen college freshmen were asked to record the number of alcoholic drinks they typically consume in a week.Here are their data: 2, 4, 6, 0, 1, 10, 9, 0, 6, 3, 6, 8, 5, 4, 6, 2.What is the mode of this distribution?

In a physical geography course, the average score on the first exam was 79 percent based on a sample of 48 students.This mean was calculated on the class grades to summarize overall performance.There are two other sections of the same class, but those students were not included in the calculation.The test average is a:

The range is less susceptible to the influence of outliers than other measures of variability.

In a distribution that is skewed by a few extreme outliers, what would be the best choice for a measure of central tendency?

A sample of 150 women results in an average weight calculation of 168 pounds.This average weight is a:

Which of these is NOT a reason to use the interquartile range instead of the range?

Of the four types of population parameters used to describe any distribution, which parameter describes how far the observations scatter around the central value?

Measures of central tendency and variability are calculated to describe the nature of charitable giving each year.These figures are computed for the "average" American citizen.In that case, the mean calculated would be taken as:

The interquartile range measures variability as the difference between the scores at the 25th and 50th percentiles.

Sixteen college freshmen were asked to record the number of alcoholic drinks that they typically consume in a week.Here are their data: 2, 4, 6, 0, 1, 10, 9, 0, 6, 3, 6, 8, 5, 4, 6, 2.What is the mean number of alcoholic drinks consumed per week?

When calculating the median for an odd number of scores, which have been placed in ascending order, the median will be the:

Here is a set of data: 44, 52, 51, 37, 49, 55, 48, 39.Compute a deviation score for the data point 44.

The dean of a local college needs to drop one course from the art program.She decides to pick the course with the lowest average enrollment rate from the previous four semesters.The enrollments of three courses she is considering are Photography-30, 20, 12, and 22; Film Editing-11, 29, 27, and 29; and Abstract Art-18, 22, 21, and 24.Which class has the lowest mean enrollment over the past four semesters?