Question 1

The correlation coefficient ranges between

Accepted Answer

A) 0 and 1 
B) -1 and +1 
C) minus infinity and plus infinity 
D) 1 and 100 
A) 0 and 1 
B) -1 and +1 
C) minus infinity and plus infinity 
D) 1 and 100

Question 2

The hourly wages of a sample of eight individuals is given below.   For the above sample, determine the following measures: 
a.The mean.
b.The standard deviation.
c.The 25th percentile.

Accepted Answer

The answer of The hourly wages of a sample of...

Question 3

The most frequently occurring value of a data set is called the

Accepted Answer

A) range 
B) mode 
C) mean 
D) None of the other answers are correct. 
A) range 
B) mode 
C) mean 
D) None of the other answers are correct.

Question 4

Exhibit 3-2
A researcher has collected the following sample data. The mean of the sample is 5.  
-__________ can be used to make statements about the proportion of data values that must be within a specified number of standard deviations of the mean.

Accepted Answer

A) Chebyshev's theorem 
B) The empirical rule 
C) A five-number summary 
D) A box plot 
A) Chebyshev's theorem 
B) The empirical rule 
C) A five-number summary 
D) A box plot

Question 5

Which of the following symbols represents the size of the sample?

Accepted Answer

A) $\sigma$2 
B) $\sigma$ 
C) N 
D) n 
A) $\sigma$2 
B) $\sigma$ 
C) N 
D) n

Question 6

Provide a five-number summary for the follow data.

Accepted Answer

Smallest = 115,
Q<su

Question 7

A sample of 9 mothers was taken. The mothers were asked the age of their oldest child. You are given their responses below.   
a. Compute the mean.
b. Compute the variance.
c. Compute the standard deviation.
d. Compute the coefficient of variation.
e. Determine the 25th percentile.
f. Determine the median
g. Determine the 75th percentile.
h. Determine the range.

Accepted Answer

a.7.56
b.17.78
c.4.2

Question 8

The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals

Accepted Answer

A) 0 
B) 4096 
C) 8 
D) 6,561 
A) 0 
B) 4096 
C) 8 
D) 6,561

Question 9

The following is a frequency distribution for the ages of a sample of employees at a local company.   
a.Determine the average age for the sample.
b.Compute the variance.
c.Compute the standard deviation.
d.Compute the coefficient of variation.

Accepted Answer

a.54.5
b.1

Question 10

The descriptive measure that is not measured in the same units as the original data is the

Accepted Answer

A) median 
B) standard deviation 
C) mode 
D) variance 
A) median 
B) standard deviation 
C) mode 
D) variance

Question 11

Which of the following is not a measure of location?

Accepted Answer

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

Question 12

Exhibit 3-1
A researcher has collected the following sample data.  
-The interquartile range is

Accepted Answer

A) the 50th percentile 
B) another name for the variance 
C) the difference between the largest and smallest values 
D) the difference between the third quartile and the first quartile 
A) the 50th percentile 
B) another name for the variance 
C) the difference between the largest and smallest values 
D) the difference between the third quartile and the first quartile

Question 13

Compute the weighted mean for the following data.

Accepted Answer

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

Question 14

The variance of the sample

Accepted Answer

A) can never be negative 
B) can be negative 
C) cannot be zero 
D) cannot be less than one 
A) can never be negative 
B) can be negative 
C) cannot be zero 
D) cannot be less than one

Question 15

Reed Auto periodically has a special week-long sale. As part of the advertising campaign Reed runs one or more television commercials during the weekend preceding the sale. Data from a sample of 5 previous sales are shown below.   Compute and interpret both the sample covariance and the sample correlation coefficient.

Accepted Answer

Sample covariance =

Question 16

Exhibit 3-2
A researcher has collected the following sample data. The mean of the sample is 5.  
-__________ can be used to determine the percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution.

Accepted Answer

A) Chebyshev's theorem 
B) empirical rule 
C) five-number summary 
D) box plot 
A) Chebyshev's theorem 
B) empirical rule 
C) five-number summary 
D) box plot

Question 17

In computing descriptive statistics from grouped data,

Accepted Answer

A) data values are treated as if they occur at the midpoint of a class 
B) the grouped data result is more accurate than the ungrouped result 
C) the grouped data computations are used only when a population is being analyzed 
D) All of these answers are correct. 
A) data values are treated as if they occur at the midpoint of a class 
B) the grouped data result is more accurate than the ungrouped result 
C) the grouped data computations are used only when a population is being analyzed 
D) All of these answers are correct.

Question 18

The measure of dispersion that is influenced most by extreme values is

Accepted Answer

A) the variance 
B) the standard deviation 
C) the range 
D) the interquartile range 
A) the variance 
B) the standard deviation 
C) the range 
D) the interquartile range

Question 19

Exhibit 3-2
A researcher has collected the following sample data. The mean of the sample is 5.  
-Refer to Exhibit 3-2. The variance is

Accepted Answer

A) 80 
B) 4.062 
C) 13.2 
D) 16.5 
A) 80 
B) 4.062 
C) 13.2 
D) 16.5

Question 20

Since the median is the middle value of a data set, it must always be

Accepted Answer

A) smaller than the mode 
B) larger than the mode 
C) smaller than the mean 
D) None of the other answers are correct. 
A) smaller than the mode 
B) larger than the mode 
C) smaller than the mean 
D) None of the other answers are correct.

The correlation coefficient ranges between

The hourly wages of a sample of eight individuals is given below. For the above sample, determine the following measures: a.The mean. b.The standard deviation. c.The 25th percentile.

The most frequently occurring value of a data set is called the

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -__________ can be used to make statements about the proportion of data values that must be within a specified number of standard deviations of the mean.

Which of the following symbols represents the size of the sample?

Provide a five-number summary for the follow data.

The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals

The following is a frequency distribution for the ages of a sample of employees at a local company. a.Determine the average age for the sample. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

The descriptive measure that is not measured in the same units as the original data is the

Which of the following is not a measure of location?

Exhibit 3-1 A researcher has collected the following sample data. -The interquartile range is

Compute the weighted mean for the following data.

The variance of the sample

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -__________ can be used to determine the percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution.

In computing descriptive statistics from grouped data,

The measure of dispersion that is influenced most by extreme values is

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -Refer to Exhibit 3-2. The variance is

Since the median is the middle value of a data set, it must always be

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

Tests of Goodness of Fit, Independence and Multiple Proportions

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

Decision Analysis

Sample Survey

Filters

Exam 3: Descriptive Statistics: Numerical Measures

The correlation coefficient ranges between

The hourly wages of a sample of eight individuals is given below. For the above sample, determine the following measures: a.The mean. b.The standard deviation. c.The 25th percentile.

The most frequently occurring value of a data set is called the

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -__________ can be used to make statements about the proportion of data values that must be within a specified number of standard deviations of the mean.

Which of the following symbols represents the size of the sample?

Provide a five-number summary for the follow data.

The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals

The following is a frequency distribution for the ages of a sample of employees at a local company. a.Determine the average age for the sample. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

The descriptive measure that is not measured in the same units as the original data is the

Which of the following is not a measure of location?

Exhibit 3-1 A researcher has collected the following sample data. -The interquartile range is

Compute the weighted mean for the following data.

The variance of the sample

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -__________ can be used to determine the percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution.

In computing descriptive statistics from grouped data,

The measure of dispersion that is influenced most by extreme values is

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -Refer to Exhibit 3-2. The variance is

Since the median is the middle value of a data set, it must always be

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

Tests of Goodness of Fit, Independence and Multiple Proportions

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

Decision Analysis

Sample Survey

Filters