Exam 4: Summarizing Data: Measures of Variation

The following is a list of the number of dollars a sample of students say they are willing to spend for a present for a close friend. Males: $25,80,30,50,45,30,260,60,50$ Females: $15,35,60,55,40,90,100,25,30$ -Find the standard deviation for the females.

(Short Answer)

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Question 41

The closer the Pearsonian coefficient of skewness is to _______ the more symmetric the distribution.

(Short Answer)

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Question 42

The standard deviation of the numbers $7,7,7, \ldots, 7$ is zero.

(True/False)

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Question 43

How does the interquartile range compare to the range when the distribution is shaped like the cross section of a bell?

(Short Answer)

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Question 44

The mean, median, and standard deviation of a list of numbers are 128, 160, and 8.2. Suppose that the number 25 is added to each number in the list. -What is the new value of the variance?

(Short Answer)

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Question 45

If the mean and standard deviation of a set of data are 60 and 5 respectively, then the values 50 and 70 have $z$ -scores which are equal in magnitude, but opposite in sign.

(True/False)

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Question 46

The frequency distribution of grades on a test for a class of 30 students is given below: -Find the variance of the grades.

(Short Answer)

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Question 47

The mean, median, and standard deviation of a list of numbers are 128, 160, and 8.2. Suppose that the number 25 is added to each number in the list. -What is the new value of the standard deviation?

(Short Answer)

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Question 48

The prices (in dollars) of 16 film video cassettes on sale at a video store are given below. $38,32,38,13,23,38,32,28,27,32,23,27,25,32,27,30$ -For this data, find the standard deviation (if the data is viewed as a population).

(Short Answer)

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Question 49

The interquartile range is a better measure of variation than:

(Multiple Choice)

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Question 50

The _______ is not a measure of variation.

(Multiple Choice)

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Question 51

Which of the following is a measure of variation?

(Multiple Choice)

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Question 52

If the mean of a set of data is negative, then the standard deviation is negative.

(True/False)

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Question 53

The three measures that are needed to calculate the Pearsonian coefficient of skewness are the mean, the median, and the _______.

(Short Answer)

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Question 54

The degree of symmetry of a distribution is given by:

(Multiple Choice)

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Question 55

The prices (in dollars) of 16 film video cassettes on sale at a video store are given below. $38,32,38,13,23,38,32,28,27,32,23,27,25,32,27,30$ -For this data, find the Pearsonian coefficient of skewness.

(Short Answer)

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Question 56

The following is a list of the number of dollars a sample of students say they are willing to spend for a present for a close friend. Males: $25,80,30,50,45,30,260,60,50$ Females: $15,35,60,55,40,90,100,25,30$ -Find the standard deviation for the females.

The closer the Pearsonian coefficient of skewness is to _______ the more symmetric the distribution.

The standard deviation of the numbers $7,7,7, \ldots, 7$ is zero.

How does the interquartile range compare to the range when the distribution is shaped like the cross section of a bell?

The mean, median, and standard deviation of a list of numbers are 128, 160, and 8.2. Suppose that the number 25 is added to each number in the list. -What is the new value of the variance?

If the mean and standard deviation of a set of data are 60 and 5 respectively, then the values 50 and 70 have $z$ -scores which are equal in magnitude, but opposite in sign.

The frequency distribution of grades on a test for a class of 30 students is given below: -Find the variance of the grades.

The mean, median, and standard deviation of a list of numbers are 128, 160, and 8.2. Suppose that the number 25 is added to each number in the list. -What is the new value of the standard deviation?

The prices (in dollars) of 16 film video cassettes on sale at a video store are given below. $38,32,38,13,23,38,32,28,27,32,23,27,25,32,27,30$ -For this data, find the standard deviation (if the data is viewed as a population).

The interquartile range is a better measure of variation than:

The _______ is not a measure of variation.

Which of the following is a measure of variation?

If the mean of a set of data is negative, then the standard deviation is negative.

The three measures that are needed to calculate the Pearsonian coefficient of skewness are the mean, the median, and the _______.

The degree of symmetry of a distribution is given by:

The prices (in dollars) of 16 film video cassettes on sale at a video store are given below. $38,32,38,13,23,38,32,28,27,32,23,27,25,32,27,30$ -For this data, find the Pearsonian coefficient of skewness.

Introduction

Summarizing Data: Listing and Grouping

Summarizing Data: Measures of Location

Possibilities and Probabilities

Some Rules of Probability

Expectations and Decisions

Probability Distributions

The Normal Distribution

Sampling and Sampling Distributions

Problems of Estimation

Tests of Hypotheses: Means

Tests of Hypotheses: Standard Deviations

Tests of Hypotheses Based on Count Data

Analysis of Variance

Regression

Correlation

Nonparametric Tests

Filters

Exam 4: Summarizing Data: Measures of Variation

The closer the Pearsonian coefficient of skewness is to _______ the more symmetric the distribution.

The standard deviation of the numbers 7,7,7,…,77,7,7, \ldots, 77,7,7,…,7 is zero.

How does the interquartile range compare to the range when the distribution is shaped like the cross section of a bell?

The mean, median, and standard deviation of a list of numbers are 128, 160, and 8.2. Suppose that the number 25 is added to each number in the list. -What is the new value of the variance?

If the mean and standard deviation of a set of data are 60 and 5 respectively, then the values 50 and 70 have zzz -scores which are equal in magnitude, but opposite in sign.

The frequency distribution of grades on a test for a class of 30 students is given below: -Find the variance of the grades.

The mean, median, and standard deviation of a list of numbers are 128, 160, and 8.2. Suppose that the number 25 is added to each number in the list. -What is the new value of the standard deviation?

The interquartile range is a better measure of variation than:

The _______ is not a measure of variation.

Which of the following is a measure of variation?

If the mean of a set of data is negative, then the standard deviation is negative.

The three measures that are needed to calculate the Pearsonian coefficient of skewness are the mean, the median, and the _______.

The degree of symmetry of a distribution is given by:

The prices (in dollars) of 16 film video cassettes on sale at a video store are given below. 38,32,38,13,23,38,32,28,27,32,23,27,25,32,27,3038,32,38,13,23,38,32,28,27,32,23,27,25,32,27,3038,32,38,13,23,38,32,28,27,32,23,27,25,32,27,30 -For this data, find the Pearsonian coefficient of skewness.

Introduction

Summarizing Data: Listing and Grouping

Summarizing Data: Measures of Location

Possibilities and Probabilities

Some Rules of Probability

Expectations and Decisions

Probability Distributions

The Normal Distribution

Sampling and Sampling Distributions

Problems of Estimation

Tests of Hypotheses: Means

Tests of Hypotheses: Standard Deviations

Tests of Hypotheses Based on Count Data

Analysis of Variance

Regression

Correlation

Nonparametric Tests

Filters

The standard deviation of the numbers $7,7,7, \ldots, 7$ is zero.

If the mean and standard deviation of a set of data are 60 and 5 respectively, then the values 50 and 70 have $z$ -scores which are equal in magnitude, but opposite in sign.

The prices (in dollars) of 16 film video cassettes on sale at a video store are given below. $38,32,38,13,23,38,32,28,27,32,23,27,25,32,27,30$ -For this data, find the Pearsonian coefficient of skewness.