Question 1

The 50th percentile is the

Accepted Answer

A)  mode. 
B)  median. 
C)  mean. 
D)  midrange. 
A)  mode. 
B)  median. 
C)  mean. 
D)  midrange.

Question 2

Which of the following descriptive statistics is not measured in the same units as the data?

Accepted Answer

A)  Mean 
B)  Standard deviation 
C)  Variance 
D)  Interquartile range 
A)  Mean 
B)  Standard deviation 
C)  Variance 
D)  Interquartile range

Question 3

A researcher has collected the following sample data. The mean of the sample is 5. 13
15
12
13
12
The interquartile range is

Accepted Answer

A)  2. 
B)  13. 
C)  3. 
D)  12. 
A)  2. 
B)  13. 
C)  3. 
D)  12.

Question 4

A researcher has collected the following sample data.   The 75th percentile is

Accepted Answer

A)  13. 
B)  14. 
C)  15. 
D)  16. 
A)  13. 
B)  14. 
C)  15. 
D)  16.

Question 5

The standard deviation of a sample of 81 observations equals 49. The variance of the sample equals

Accepted Answer

A)  7. 
B)  9. 
C)  2401. 
D)  6561. 
A)  7. 
B)  9. 
C)  2401. 
D)  6561.

Question 6

The closing stock price of MNM Corporation for the last 7 trading days is shown below.   ​ The mode is

Accepted Answer

A)  24. 
B)  25. 
C)  26. 
D)  27. 
A)  24. 
B)  25. 
C)  26. 
D)  27.

Question 7

The variance of a sample of 144 observations equals 576. The standard deviation of the sample equals

Accepted Answer

A)  12. 
B)  21. 
C)  441. 
D)  63,504. 
A)  12. 
B)  21. 
C)  441. 
D)  63,504.

Question 8

The standard deviation of a sample was reported to be 20. The report indicated that   = 7200. What is the sample size?

Accepted Answer

A)  16 
B)  17 
C)  18 
D)  19 
A)  16 
B)  17 
C)  18 
D)  19

Question 9

The value of the sum of the deviations from the mean, i.e.,   must always be

Accepted Answer

A)  less than the zero. 
B)  negative. 
C)  either positive or negative depending on whether the mean is negative or positive. 
D)  zero. 
A)  less than the zero. 
B)  negative. 
C)  either positive or negative depending on whether the mean is negative or positive. 
D)  zero.

Question 10

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated. mean = 160
Range = 60
Mode = 165
Variance = 324
Median = 170
The coefficient of variation equals

Accepted Answer

A)  0.1125%. 
B)  11.25%. 
C)  203.12%. 
D)  0.20312%. 
A)  0.1125%. 
B)  11.25%. 
C)  203.12%. 
D)  0.20312%.

Question 11

An important numerical measure of the shape of a distribution is the

Accepted Answer

A)  5-number summary 
B)  z-score. 
C)  coefficient of variation. 
D)  skewness. 
A)  5-number summary 
B)  z-score. 
C)  coefficient of variation. 
D)  skewness.

Question 12

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

Accepted Answer

A)  ​mean. 
B)  ​median. 
C)  ​mode. 
D)  ​outlier. 
A)  ​mean. 
B)  ​median. 
C)  ​mode. 
D)  ​outlier.

Question 13

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

Accepted Answer

A)  σ2 
B)  σ 
C)  μ 
D)  N 
A)  σ2 
B)  σ 
C)  μ 
D)  N

Question 14

​The __________ can be interpreted as the number of standard deviations a data value is from the mean of all the data values.

Accepted Answer

A)  ​skewness 
B)  ​coefficient of variation 
C)  ​z-score 
D)  ​correlation coefficient 
A)  ​skewness 
B)  ​coefficient of variation 
C)  ​z-score 
D)  ​correlation coefficient

Question 15

Positive values of covariance indicate

Accepted Answer

A)  a positive variance of the x values. 
B)  a positive variance of the y values. 
C)  the standard deviation is positive. 
D)  positive relation between the independent and the dependent variables. 
A)  a positive variance of the x values. 
B)  a positive variance of the y values. 
C)  the standard deviation is positive. 
D)  positive relation between the independent and the dependent variables.

Question 16

A researcher has collected the following sample data. The mean of the sample is 5.   The standard deviation is

Accepted Answer

A)  1.10. 
B)  1.2. 
C)  1.22. 
D)  1.5. 
A)  1.10. 
B)  1.2. 
C)  1.22. 
D)  1.5.

Question 17

The variance of the sample

Accepted Answer

A)  cannot be negative. 
B)  cannot be positive. 
C)  cannot be zero. 
D)  cannot be less than one. 
A)  cannot be negative. 
B)  cannot be positive. 
C)  cannot be zero. 
D)  cannot be less than one.

Question 18

The following is the frequency distribution for the speed of a sample of automobiles traveling on an interstate highway.   The standard deviation is

Accepted Answer

A)  9.06. 
B)  9.28. 
C)  86.19. 
D)  82.09. 
A)  9.06. 
B)  9.28. 
C)  86.19. 
D)  82.09.

Question 19

The symbol σ2 is used to represent the

Accepted Answer

A)  variance of the population. 
B)  standard deviation of the sample. 
C)  standard deviation of the population. 
D)  variance of the sample. 
A)  variance of the population. 
B)  standard deviation of the sample. 
C)  standard deviation of the population. 
D)  variance of the sample.

Question 20

Which of the following symbols represents the mean of the population?

Accepted Answer

A)  σ2 
B)  σ 
C)  μ 
D)    
A)  σ2 
B)  σ 
C)  μ 
D)

Exam 3: Descriptive Statistics: Numerical Measures

The 50th percentile is the

Which of the following descriptive statistics is not measured in the same units as the data?

A researcher has collected the following sample data. The mean of the sample is 5. 13 15 12 13 12 The interquartile range is

A researcher has collected the following sample data. The 75th percentile is

The standard deviation of a sample of 81 observations equals 49. The variance of the sample equals

The closing stock price of MNM Corporation for the last 7 trading days is shown below. ​ The mode is

The variance of a sample of 144 observations equals 576. The standard deviation of the sample equals

The standard deviation of a sample was reported to be 20. The report indicated that = 7200. What is the sample size?

The value of the sum of the deviations from the mean, i.e., must always be

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated. mean = 160 Range = 60 Mode = 165 Variance = 324 Median = 170 The coefficient of variation equals

An important numerical measure of the shape of a distribution is the

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

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

​The __________ can be interpreted as the number of standard deviations a data value is from the mean of all the data values.

Positive values of covariance indicate

A researcher has collected the following sample data. The mean of the sample is 5. The standard deviation is

The variance of the sample

The following is the frequency distribution for the speed of a sample of automobiles traveling on an interstate highway. The standard deviation is

The symbol σ2 is used to represent the

Which of the following symbols represents the mean of the population?

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, Tests 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

Decision Analysis

Index Numbers

Statistical Methods for Quality Control

Sample Survey

Filters

The closing stock price of MNM Corporation for the last 7 trading days is shown below. The mode is

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

The __________ can be interpreted as the number of standard deviations a data value is from the mean of all the data values.

The symbol σ² is used to represent the