Exam 3: Describing Data: Numerical Measures

A study measured the number of hours a light bulb will operate before it burns out.If the variance of this distribution were computed,what would be the unit of measure? _____________________.

(Short Answer)

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Question 21

If a distribution is highly skewed,what measure of central location should be avoided? _____________.

(Short Answer)

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Question 22

What is the median of 26,30,24,32,32,31,27 and 29?

(Multiple Choice)

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Question 23

According to Chebyshev's Theorem,75% percent of the observations lie within plus and minus 2.00 average mean deviations.

(True/False)

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Question 24

For a data set,half of the observations are always greater than the

(Multiple Choice)

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Question 25

The standard deviation is the positive square root of the variance.

(True/False)

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Question 26

The value that occurs most often in a set of data is called the _____.

(Short Answer)

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Question 27

The mode is the value of the observation that appears most frequently.

(True/False)

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Question 28

Which measures of central location are not affected by extremely small or extremely large values?

(Multiple Choice)

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Question 29

In a company,the standard deviation of the ages of female employees is six years and the standard deviation of the ages of male employees is ten years.These statistics indicate that the dispersion of age is greater for females than for males.

(True/False)

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Question 30

What is the relationship among the mean,median and mode in a symmetric distribution?

(Multiple Choice)

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Question 31

Dispersion describes the degree of variation in the data.

(True/False)

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Question 32

In a negatively skewed distribution,the mean is smaller than the median or mode and the mode occurs at the peak of the curve.

(True/False)

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Question 33

Fifteen accounting majors had an average grade of 90 on a finance exam.Seven marketing majors averaged 85,while ten finance majors averaged 93 on the same exam.What is the weighted mean for the 32 students taking the exam?

(Multiple Choice)

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Question 34

For an ordered data set with an even number of ungrouped values,the median is the arithmetic mean of the two middle values.

(True/False)

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Question 35

Rank the measures of dispersion in terms of their relative ease of interpretation from least to most difficulty.

(Multiple Choice)

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Question 36

If we find the deviation of each value from the median,the sum of these deviations is always zero.

(True/False)

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Question 37

Samples of the wires coming off the production line were tested for tensile strength.The statistical results (in PSI)were: According to the Empirical Rule,the middle 95 percent of the wires tested between approximately what two values?

(Multiple Choice)

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Question 38

Rank the measures of dispersion in terms of their relative computational difficulty from least to most difficulty.

(Multiple Choice)

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Question 39

Which of the following measures of dispersion are based on deviations from the mean?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 115

A study measured the number of hours a light bulb will operate before it burns out.If the variance of this distribution were computed,what would be the unit of measure? _____________________.

If a distribution is highly skewed,what measure of central location should be avoided? _____________.

What is the median of 26,30,24,32,32,31,27 and 29?

According to Chebyshev's Theorem,75% percent of the observations lie within plus and minus 2.00 average mean deviations.

For a data set,half of the observations are always greater than the

The standard deviation is the positive square root of the variance.

The value that occurs most often in a set of data is called the _____.

The mode is the value of the observation that appears most frequently.

Which measures of central location are not affected by extremely small or extremely large values?

In a company,the standard deviation of the ages of female employees is six years and the standard deviation of the ages of male employees is ten years.These statistics indicate that the dispersion of age is greater for females than for males.

What is the relationship among the mean,median and mode in a symmetric distribution?

Dispersion describes the degree of variation in the data.

In a negatively skewed distribution,the mean is smaller than the median or mode and the mode occurs at the peak of the curve.

Fifteen accounting majors had an average grade of 90 on a finance exam.Seven marketing majors averaged 85,while ten finance majors averaged 93 on the same exam.What is the weighted mean for the 32 students taking the exam?

For an ordered data set with an even number of ungrouped values,the median is the arithmetic mean of the two middle values.

Rank the measures of dispersion in terms of their relative ease of interpretation from least to most difficulty.

If we find the deviation of each value from the median,the sum of these deviations is always zero.

Samples of the wires coming off the production line were tested for tensile strength.The statistical results (in PSI)were: According to the Empirical Rule,the middle 95 percent of the wires tested between approximately what two values?

Rank the measures of dispersion in terms of their relative computational difficulty from least to most difficulty.

Which of the following measures of dispersion are based on deviations from the mean?

What Is Statistics

Describing Data: Frequency Distributions and Graphic Presentations

Describing Data: Displaying and Exploring Data

A Survey of Probability Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Methods and the Central Limit Theorem

Estimation and Confidence Intervals

One-Sample Tests of Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Linear Regression and Correlation

Multiple Regression and Correlation Analysis

Chi-Square Applications

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