Question 1

Since the population is always larger than the sample, the value of the sample mean

Accepted Answer

A) is always smaller than the true value of the population mean 
B) is always larger than the true value of the population mean 
C) is always equal to the true value of the population mean 
D) could be larger, equal to, or smaller than the true value of the population mean 
A) is always smaller than the true value of the population mean 
B) is always larger than the true value of the population mean 
C) is always equal to the true value of the population mean 
D) could be larger, equal to, or smaller than the true value of the population mean

Question 2

The measure of dispersion which is not measured in the same units as the original data is the

Accepted Answer

A) median 
B) standard deviation 
C) coefficient of determination 
D) variance 
A) median 
B) standard deviation 
C) coefficient of determination 
D) variance

Question 3

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

Accepted Answer

A) 72.66% 
B) 81.24% 
C) 264% 
D) 330% 
A) 72.66% 
B) 81.24% 
C) 264% 
D) 330%

Question 4

A researcher has obtained the number of hours worked per week during the summer for a sample of fifteen students.
   Using this data set, compute the
a. median
b. mean
c. mode
d. 40th percentile
e. range
f. sample variance
g. standard deviation

Accepted Answer

a.25
b.25

Question 5

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

Accepted Answer

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

Question 6

If the coefficient of variation is 40% and the mean is 70, then the variance is

Accepted Answer

A) 28 
B) 2800 
C) 1.75 
D) 784 
A) 28 
B) 2800 
C) 1.75 
D) 784

Question 7

The difference between the largest and the smallest data values is the

Accepted Answer

A) variance 
B) interquartile range 
C) range 
D) coefficient of variation 
A) variance 
B) interquartile range 
C) range 
D) coefficient of variation

Question 8

In the fall semester of 2009, the average Graduate Management Admission Test (GMAT) of the students at UTC was 500 with a standard deviation of 80. In the fall of 2010, the average GMAT was 560 with a standard deviation of 84. Which year's GMAT scores show a more dispersed distribution?

Accepted Answer

The coefficient of variation i

Question 9

When data are positively skewed, the mean will usually be

Accepted Answer

A) greater than the median 
B) smaller than the median 
C) equal to the median 
D) positive 
A) greater than the median 
B) smaller than the median 
C) equal to the median 
D) positive

Question 10

The most important statistical descriptive measure of the location of a data set is the

Accepted Answer

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

Question 11

From a population of size 1,000, a random sample of 100 items is selected. The mean of the sample

Accepted Answer

A) must be 10 times smaller than the mean of the population 
B) must be equal to the mean of the population, if the sample is truly random 
C) must be 10 times larger than the mean of the population 
D) can be larger, smaller or equal to the mean of the population 
A) must be 10 times smaller than the mean of the population 
B) must be equal to the mean of the population, if the sample is truly random 
C) must be 10 times larger than the mean of the population 
D) can be larger, smaller or equal to the mean of the population

Question 12

Which of the following is not a measure of dispersion?

Accepted Answer

A) the range 
B) the 50th percentile 
C) the standard deviation 
D) the interquartile range 
A) the range 
B) the 50th percentile 
C) the standard deviation 
D) the interquartile range

Question 13

Which of the following symbols represents the standard deviation of the population?

Accepted Answer

A)  $\sigma$2 
B)  $\sigma$ 
C) $\mu$ 
D) $ \overline{\mathrm{x}} $ 
A)  $\sigma$2 
B)  $\sigma$ 
C) $\mu$ 
D) $ \overline{\mathrm{x}} $

Question 14

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

Accepted Answer

A) 6.969 
B) 7.071 
C) 48.570 
D) 50.000 
A) 6.969 
B) 7.071 
C) 48.570 
D) 50.000

Question 15

The standard deviation of a sample of 100 observations equals 64. The variance of the sample equals

Accepted Answer

A) 8 
B) 10 
C) 6400 
D) 4,096 
A) 8 
B) 10 
C) 6400 
D) 4,096

Question 16

Descriptive statistics for the closing stock prices of two companies for several trading periods are shown below.
   
a.Which company's stock price has a more dispersed distribution? Explain. Show your complete work and support your answer.
b.Compare the Skewness of the two and explain what is indicated.

Accepted Answer

a.Coefficient of variation for Baba, Inc

Question 17

Compute the weighted mean for the following data.

Accepted Answer

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

Question 18

The following data represent the daily demand (y in thousands of units) and the unit price (x in dollars) for a product.
   
a.Compute and interpret the sample covariance for the above data.
b.Compute and interpret the sample correlation coefficient.

Accepted Answer

a.-47. Since the covariance is

Question 19

The coefficient of variation is

Accepted Answer

A) the same as the variance 
B) the standard deviation divided by the mean times 100 
C) the square of the standard deviation 
D) the mean divided by the standard deviation 
A) the same as the variance 
B) the standard deviation divided by the mean times 100 
C) the square of the standard deviation 
D) the mean divided by the standard deviation

Question 20

A box plot is a graphical technique which is used for

Accepted Answer

A) only one group of data 
B) making comparisons between only two groups 
C) making comparisons between two or more groups 
D) summing the deviations from the mean and placing the sum in a box 
A) only one group of data 
B) making comparisons between only two groups 
C) making comparisons between two or more groups 
D) summing the deviations from the mean and placing the sum in a box

Since the population is always larger than the sample, the value of the sample mean

The measure of dispersion which is not measured in the same units as the original data is the

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

A researcher has obtained the number of hours worked per week during the summer for a sample of fifteen students. Using this data set, compute the a. median b. mean c. mode d. 40th percentile e. range f. sample variance g. standard deviation

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

If the coefficient of variation is 40% and the mean is 70, then the variance is

The difference between the largest and the smallest data values is the

In the fall semester of 2009, the average Graduate Management Admission Test (GMAT) of the students at UTC was 500 with a standard deviation of 80. In the fall of 2010, the average GMAT was 560 with a standard deviation of 84. Which year's GMAT scores show a more dispersed distribution?

When data are positively skewed, the mean will usually be

The most important statistical descriptive measure of the location of a data set is the

From a population of size 1,000, a random sample of 100 items is selected. The mean of the sample

Which of the following is not a measure of dispersion?

Which of the following symbols represents the standard deviation of the population?

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 standard deviation of a sample of 100 observations equals 64. The variance of the sample equals

Compute the weighted mean for the following data.

The following data represent the daily demand (y in thousands of units) and the unit price (x in dollars) for a product. a.Compute and interpret the sample covariance for the above data. b.Compute and interpret the sample correlation coefficient.

The coefficient of variation is

A box plot is a graphical technique which is used for

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Means, Experimental Design and Analysis of Variance

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

Multiple Regression

Filters

Exam 3: Descriptive Statistics: Numerical Measures

Since the population is always larger than the sample, the value of the sample mean

The measure of dispersion which is not measured in the same units as the original data is the

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

A researcher has obtained the number of hours worked per week during the summer for a sample of fifteen students. Using this data set, compute the a. median b. mean c. mode d. 40th percentile e. range f. sample variance g. standard deviation

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

If the coefficient of variation is 40% and the mean is 70, then the variance is

The difference between the largest and the smallest data values is the

In the fall semester of 2009, the average Graduate Management Admission Test (GMAT) of the students at UTC was 500 with a standard deviation of 80. In the fall of 2010, the average GMAT was 560 with a standard deviation of 84. Which year's GMAT scores show a more dispersed distribution?

When data are positively skewed, the mean will usually be

The most important statistical descriptive measure of the location of a data set is the

From a population of size 1,000, a random sample of 100 items is selected. The mean of the sample

Which of the following is not a measure of dispersion?

Which of the following symbols represents the standard deviation of the population?

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 standard deviation of a sample of 100 observations equals 64. The variance of the sample equals

Compute the weighted mean for the following data.

The following data represent the daily demand (y in thousands of units) and the unit price (x in dollars) for a product. a.Compute and interpret the sample covariance for the above data. b.Compute and interpret the sample correlation coefficient.

The coefficient of variation is

A box plot is a graphical technique which is used for

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Means, Experimental Design and Analysis of Variance

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

Multiple Regression

Filters