Question 1

The heights (in inches) of 25 individuals were recorded and the following statistics were calculated   The coefficient of variation equals

Accepted Answer

A)  11.2%. 
B)  1120%. 
C)  0.4%. 
D)  40%. 
A)  11.2%. 
B)  1120%. 
C)  0.4%. 
D)  40%.

Question 2

In 2012, the average donation to the Help Way was $225 with a standard deviation of $45.In 2013, the average donation was $400 with a standard deviation of $60.In which year did the donations show a more dispersed distribution?

Accepted Answer

The coefficient of variation i

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

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

Question 5

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 6

Which difficulty of range as a measure of variability is overcome by interquartile range?

Accepted Answer

A)  The sum of the range variances is zero 
B)  The range is difficult to compute 
C)  The range is influenced too much by extreme values 
D)  The range is negative 
A)  The sum of the range variances is zero 
B)  The range is difficult to compute 
C)  The range is influenced too much by extreme values 
D)  The range is negative

Question 7

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 8

The interquartile range is

Accepted Answer

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

Question 9

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)  none of these alternatives is 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)  none of these alternatives is correct.

Question 10

​An unusually small or unusually large data value is called

Accepted Answer

A)  correlation coefficient. 
B)  ​a deviation. 
C)  ​an outlier. 
D)  ​a variable. 
A)  correlation coefficient. 
B)  ​a deviation. 
C)  ​an outlier. 
D)  ​a variable.

Question 11

The sample variance

Accepted Answer

A)  is always smaller than the true value of the population variance. 
B)  is always larger than the true value of the population variance. 
C)  could be smaller, equal to, or larger than the true value of the population variance. 
D)  can never be zero. 
A)  is always smaller than the true value of the population variance. 
B)  is always larger than the true value of the population variance. 
C)  could be smaller, equal to, or larger than the true value of the population variance. 
D)  can never be zero.

Question 12

The standard deviation of a sample was reported to be 7.The report indicated that   = 980.What is the sample size?

Accepted Answer

The answer of The standard deviation of a sample was...

Question 13

If two groups of numbers have the same mean, then

Accepted Answer

A)  their standard deviations must also be equal. 
B)  their medians must also be equal. 
C)  their modes must also be equal. 
D)  other measures of location need not be the same. 
A)  their standard deviations must also be equal. 
B)  their medians must also be equal. 
C)  their modes must also be equal. 
D)  other measures of location need not be the same.

Question 14

During a cold winter, the temperature stayed below zero for ten days (ranging from -20 to -5).The variance of the temperatures of the ten-day period

Accepted Answer

A)  is negative since all the numbers are negative. 
B)  must be at least zero. 
C)  cannot be computed since all the numbers are negative. 
D)  can be either negative or positive. 
A)  is negative since all the numbers are negative. 
B)  must be at least zero. 
C)  cannot be computed since all the numbers are negative. 
D)  can be either negative or positive.

Question 15

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

Accepted Answer

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

Question 16

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 17

The empirical rule states that, for data having a bell-shaped distribution, the percentage of data values being within one standard deviation of the mean is approximately

Accepted Answer

A)  25%. 
B)  50%. 
C)  68%. 
D)  95%. 
A)  25%. 
B)  50%. 
C)  68%. 
D)  95%.

Question 18

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 19

Since the median is the middle value of a data set it

Accepted Answer

A)  must always be smaller than the mode. 
B)  must always be larger than the mode. 
C)  must always be smaller than the mean. 
D)  none of these alternatives is correct. 
A)  must always be smaller than the mode. 
B)  must always be larger than the mode. 
C)  must always be smaller than the mean. 
D)  none of these alternatives is correct.

Question 20

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

Accepted Answer

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

The heights (in inches) of 25 individuals were recorded and the following statistics were calculated The coefficient of variation equals

In 2012, the average donation to the Help Way was $225 with a standard deviation of $45.In 2013, the average donation was $400 with a standard deviation of $60.In which year did the donations show a more dispersed distribution?

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

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

The variance of the sample

Which difficulty of range as a measure of variability is overcome by interquartile range?

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

The interquartile range is

In computing descriptive statistics from grouped data,

An unusually small or unusually large data value is called

The sample variance

The standard deviation of a sample was reported to be 7.The report indicated that = 980.What is the sample size?

If two groups of numbers have the same mean, then

During a cold winter, the temperature stayed below zero for ten days (ranging from -20 to -5).The variance of the temperatures of the ten-day period

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

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

The empirical rule states that, for data having a bell-shaped distribution, the percentage of data values being within one standard deviation of the mean is approximately

The correlation coefficient ranges between

Since the median is the middle value of a data set it

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

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

Filters

Exam 3: Descriptive Statistics: Numerical Measures

The heights (in inches) of 25 individuals were recorded and the following statistics were calculated The coefficient of variation equals

In 2012, the average donation to the Help Way was $225 with a standard deviation of $45.In 2013, the average donation was $400 with a standard deviation of $60.In which year did the donations show a more dispersed distribution?

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

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

The variance of the sample

Which difficulty of range as a measure of variability is overcome by interquartile range?

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

The interquartile range is

In computing descriptive statistics from grouped data,

​An unusually small or unusually large data value is called

The sample variance

The standard deviation of a sample was reported to be 7.The report indicated that = 980.What is the sample size?

If two groups of numbers have the same mean, then

During a cold winter, the temperature stayed below zero for ten days (ranging from -20 to -5).The variance of the temperatures of the ten-day period

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

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

The empirical rule states that, for data having a bell-shaped distribution, the percentage of data values being within one standard deviation of the mean is approximately

The correlation coefficient ranges between

Since the median is the middle value of a data set it

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

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

Filters

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

An unusually small or unusually large data value is called