Question 1

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

Accepted Answer

A) the smallest value 
B) the largest value 
C) the mean 
D) the 25th percentile 
A) the smallest value 
B) the largest value 
C) the mean 
D) the 25th percentile

Question 2

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?

Accepted Answer

A) 4 
B) 415 
C) 19 
D) 22 
A) 4 
B) 415 
C) 19 
D) 22

Question 3

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

Accepted Answer

Mean = 434

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

A) range 
B) median 
C) mean 
D) mode 
A) range 
B) median 
C) mean 
D) mode

Question 6

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

Accepted Answer

A) 15 
B) square root of 15 
C) 120 
D) fifth root of 120 
A) 15 
B) square root of 15 
C) 120 
D) fifth root of 120

Question 7

A numerical measure of linear association between two variables is the

Accepted Answer

A) variance 
B) covariance 
C) standard deviation 
D) coefficient of variation 
A) variance 
B) covariance 
C) standard deviation 
D) coefficient of variation

Question 8

The first quartile

Accepted Answer

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 
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

Question 9

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.

Accepted Answer

a.69.5
b.5

Question 10

The mean of a sample

Accepted Answer

A) is always equal to the mean of the population 
B) is always smaller than the mean of the population 
C) is computed by summing the data values and dividing the sum by (n - 1) 
D) is computed by summing all the data values and dividing the sum by the number of items 
A) is always equal to the mean of the population 
B) is always smaller than the mean of the population 
C) is computed by summing the data values and dividing the sum by (n - 1) 
D) is computed by summing all the data values and dividing the sum by the number of items

Question 11

The numerical value of the variance

Accepted Answer

A) is always larger than the numerical value of the standard deviation 
B) is always smaller than the numerical value of the standard deviation 
C) is negative if the mean is negative 
D) can be larger or smaller than the numerical value of the standard deviation 
A) is always larger than the numerical value of the standard deviation 
B) is always smaller than the numerical value of the standard deviation 
C) is negative if the mean is negative 
D) can be larger or smaller than the numerical value of the standard deviation

Question 12

Compute the weighted mean for the following data.

Accepted Answer

The answer of Compute the weighted mean for the following...

Question 13

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

Accepted Answer

a.95
b.12.

Question 14

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.

Accepted Answer

C.V. for 2008 = 18%,

Question 15

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

Accepted Answer

A) 1 
B) 2 
C) 10 
D) 12 
A) 1 
B) 2 
C) 10 
D) 12

Question 16

The nth root of the product of the n observations is

Accepted Answer

A) weighted mean 
B) geometric mean 
C) product deviation 
D) the sum of squares 
A) weighted mean 
B) geometric mean 
C) product deviation 
D) the sum of squares

Question 17

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

Accepted Answer

A) 25% 
B) 21.91% 
C) 5.477% 
D) 30% 
A) 25% 
B) 21.91% 
C) 5.477% 
D) 30%

Question 18

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

Accepted Answer

a.83
b.86

Question 19

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

Accepted Answer

A) less than or equal to this value 
B) less than this value 
C) more than or equal to this value 
D) more than this value 
A) less than or equal to this value 
B) less than this value 
C) more than or equal to this value 
D) more than this value

Question 20

Geometric mean is a measure of

Accepted Answer

A) location 
B) dispersion 
C) variability 
D) weight of items, when arranged in descending order 
A) location 
B) dispersion 
C) variability 
D) weight of items, when arranged in descending order

Exam 3: Descriptive Statistics: Numerical Measures

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

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?

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

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

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

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

A numerical measure of linear association between two variables is the

The first quartile

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.

The mean of a sample

The numerical value of the variance

Compute the weighted mean for the following data.

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

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.

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

The nth root of the product of the n observations is

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

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

Geometric mean is a measure of

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Test of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

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