Question 1

Outliers are indicated using fences on a

Accepted Answer

A)  box plot. 
B)  dot plot. 
C)  histogram. 
D)  Pareto chart. 
A)  box plot. 
B)  dot plot. 
C)  histogram. 
D)  Pareto chart.

Question 2

Which two statistics offer robust measures of center when outliers are present?

Accepted Answer

A)  Mean and mode. 
B)  Median and trimmed mean. 
C)  Midrange and geometric mean. 
D)  Variance and standard deviation. 
A)  Mean and mode. 
B)  Median and trimmed mean. 
C)  Midrange and geometric mean. 
D)  Variance and standard deviation.

Question 3

The median of 600,800,1000,1200 is:

Accepted Answer

A)  800. 
B)  1000. 
C)  900. 
A)  800. 
B)  1000. 
C)  900.

Question 4

Three randomly chosen California students were asked how many times they drove to Mexico last year.Their replies were 4,5,6.The geometric mean is:

Accepted Answer

A)  3.87. 
B)  5.00. 
C)  5.42. 
D)  4.93. 
A)  3.87. 
B)  5.00. 
C)  5.42. 
D)  4.93.

Question 5

The owner of a chicken farm kept track of each hen's eating and egg production for many months,with the results below.Which has more variation,feed consumption or egg output?

Accepted Answer

Feed CV = 14.3 perce

Question 6

Exam scores in a small class were 0,50,50,70,70,80,90,90,100,100.For this data set,which statement is incorrect concerning measures of center?

Accepted Answer

A)  The median is 70. 
B)  The mode is not helpful. 
C)  The geometric mean is useless. 
D)  The mean is 70. 
A)  The median is 70. 
B)  The mode is not helpful. 
C)  The geometric mean is useless. 
D)  The mean is 70.

Question 7

The values of xmin and xmax can be inferred accurately except in a:

Accepted Answer

A)  box plot. 
B)  dot plot. 
C)  histogram. 
D)  scatter plot. 
A)  box plot. 
B)  dot plot. 
C)  histogram. 
D)  scatter plot.

Question 8

Which is not a measure of variability?

Accepted Answer

A)  Mean absolute deviation (MA
D)  
B)  Standard deviation 
C)  Midhinge 
D)  Interquartile range 
A)  Mean absolute deviation (MA
D)  
B)  Standard deviation 
C)  Midhinge 
D)  Interquartile range

Question 9

Below are shown a dot plot and summary statistics for a random sample of 34 shower heads.The measurements are maximum flow rates (in gallons per minute)at pressure of 80 pounds per square inch.Use the data to illustrate the difference between the two alternative definitions of "outlier," and make any other comments you feel are relevant.Note: TrimMean removes the smallest 5 percent and the largest 5 percent of the values.

Accepted Answer

Upper inner fence is 3.5,upper outer fen

Question 10

For U.S.adult males,the mean height is 178 cm with a standard deviation of 8 cm and the mean weight is 84 kg with a standard deviation of 8 kg.Elmer is 170 cm tall and weighs 70 kg.It is most nearly correct to say that:

Accepted Answer

A)  Elmer's weight is more unusual than his height. 
B)  Elmer is heavier than he is tall. 
C)  Height and weight have the same degree of variation. 
D)  Height has more variation than weight. 
A)  Elmer's weight is more unusual than his height. 
B)  Elmer is heavier than he is tall. 
C)  Height and weight have the same degree of variation. 
D)  Height has more variation than weight.

Question 11

Given the data set 10,5,2,6,3,4,20,the median value is 5.

Accepted Answer

A) True 
 B)False

Question 12

If the mean and median of a population are the same,then its distribution is:

Accepted Answer

A)  normal. 
B)  skewed. 
C)  symmetric. 
D)  uniform. 
A)  normal. 
B)  skewed. 
C)  symmetric. 
D)  uniform.

Question 13

The 25th percentile for waiting time in a doctor's office is 10 minutes.The 75th percentile is 30 minutes.Which is incorrect regarding the fences?

Accepted Answer

A)  The upper inner fence is 60 minutes. 
B)  The upper outer fence is 90 minutes. 
C)  A waiting time of 45 minutes would be an outlier. 
D)  The lower fences are not relevant in this problem. 
A)  The upper inner fence is 60 minutes. 
B)  The upper outer fence is 90 minutes. 
C)  A waiting time of 45 minutes would be an outlier. 
D)  The lower fences are not relevant in this problem.

Question 14

One benefit of the box plot is that it clearly displays the standard deviation.

Accepted Answer

A) True 
 B)False

Question 15

As a measure of variability,compared to the range,an advantage of the standard deviation is:

Accepted Answer

A)  being calculated easily through the use of a formula. 
B)  considering only the data values in the middle of the data array. 
C)  describing the distance between the highest and lowest values. 
D)  considering all data values. 
A)  being calculated easily through the use of a formula. 
B)  considering only the data values in the middle of the data array. 
C)  describing the distance between the highest and lowest values. 
D)  considering all data values.

Question 16

Which is not a characteristic of the standard deviation?

Accepted Answer

A)  It is always the square root of the variance. 
B)  It is not applicable when data are continuous. 
C)  It can be calculated when the data contain negative or zero values. 
D)  Its physical interpretation is not as easy as the MAD. 
A)  It is always the square root of the variance. 
B)  It is not applicable when data are continuous. 
C)  It can be calculated when the data contain negative or zero values. 
D)  Its physical interpretation is not as easy as the MAD.

Question 17

Which is not a characteristic of the geometric mean as a measure of center?

Accepted Answer

A)  It is similar to the mean if the data are skewed right. 
B)  It mitigates the effects of large data values. 
C)  It is useful in business data to calculate average growth rates. 
D)  It cannot be calculated when the data contain negative or zero values. 
A)  It is similar to the mean if the data are skewed right. 
B)  It mitigates the effects of large data values. 
C)  It is useful in business data to calculate average growth rates. 
D)  It cannot be calculated when the data contain negative or zero values.

Question 18

When applying the Empirical Rule to a distribution of grades,if a student scored one standard deviation below the mean,then she would be at the 25th percentile of the distribution.

Accepted Answer

A) True 
 B)False

Question 19

The 25th percentile for waiting time in a doctor's office is 19 minutes.The 75th percentile is 31 minutes.The interquartile range is:

Accepted Answer

A)  12 minutes. 
B)  16 minutes. 
C)  22 minutes. 
D)  impossible to determine without knowing n. 
A)  12 minutes. 
B)  16 minutes. 
C)  22 minutes. 
D)  impossible to determine without knowing n.

Question 20

Referring to this graph of ice cream fat content,the second quartile is about 61.

Accepted Answer

A) True 
 B)False

Outliers are indicated using fences on a

Which two statistics offer robust measures of center when outliers are present?

The median of 600,800,1000,1200 is:

Three randomly chosen California students were asked how many times they drove to Mexico last year.Their replies were 4,5,6.The geometric mean is:

The owner of a chicken farm kept track of each hen's eating and egg production for many months,with the results below.Which has more variation,feed consumption or egg output?

Exam scores in a small class were 0,50,50,70,70,80,90,90,100,100.For this data set,which statement is incorrect concerning measures of center?

The values of x_min and x_max can be inferred accurately except in a:

Which is not a measure of variability?

For U.S.adult males,the mean height is 178 cm with a standard deviation of 8 cm and the mean weight is 84 kg with a standard deviation of 8 kg.Elmer is 170 cm tall and weighs 70 kg.It is most nearly correct to say that:

Given the data set 10,5,2,6,3,4,20,the median value is 5.

If the mean and median of a population are the same,then its distribution is:

The 25^th percentile for waiting time in a doctor's office is 10 minutes.The 75^th percentile is 30 minutes.Which is incorrect regarding the fences?

One benefit of the box plot is that it clearly displays the standard deviation.

As a measure of variability,compared to the range,an advantage of the standard deviation is:

Which is not a characteristic of the standard deviation?

Which is not a characteristic of the geometric mean as a measure of center?

When applying the Empirical Rule to a distribution of grades,if a student scored one standard deviation below the mean,then she would be at the 25^th percentile of the distribution.

The 25^th percentile for waiting time in a doctor's office is 19 minutes.The 75^th percentile is 31 minutes.The interquartile range is:

Referring to this graph of ice cream fat content,the second quartile is about 61.

Overview of Statistics

Data Collection

Describing Data Visually

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Time-Series Analysis

Chi-Square Tests

Nonparametric Tests

Quality Management

Filters

Exam 4: Descriptive Statistics

Outliers are indicated using fences on a

Which two statistics offer robust measures of center when outliers are present?

The median of 600,800,1000,1200 is:

Three randomly chosen California students were asked how many times they drove to Mexico last year.Their replies were 4,5,6.The geometric mean is:

The owner of a chicken farm kept track of each hen's eating and egg production for many months,with the results below.Which has more variation,feed consumption or egg output?

Exam scores in a small class were 0,50,50,70,70,80,90,90,100,100.For this data set,which statement is incorrect concerning measures of center?

The values of xmin and xmax can be inferred accurately except in a:

Which is not a measure of variability?

For U.S.adult males,the mean height is 178 cm with a standard deviation of 8 cm and the mean weight is 84 kg with a standard deviation of 8 kg.Elmer is 170 cm tall and weighs 70 kg.It is most nearly correct to say that:

Given the data set 10,5,2,6,3,4,20,the median value is 5.

If the mean and median of a population are the same,then its distribution is:

The 25th percentile for waiting time in a doctor's office is 10 minutes.The 75th percentile is 30 minutes.Which is incorrect regarding the fences?

One benefit of the box plot is that it clearly displays the standard deviation.

As a measure of variability,compared to the range,an advantage of the standard deviation is:

Which is not a characteristic of the standard deviation?

Which is not a characteristic of the geometric mean as a measure of center?

When applying the Empirical Rule to a distribution of grades,if a student scored one standard deviation below the mean,then she would be at the 25th percentile of the distribution.

The 25th percentile for waiting time in a doctor's office is 19 minutes.The 75th percentile is 31 minutes.The interquartile range is:

Referring to this graph of ice cream fat content,the second quartile is about 61.

Overview of Statistics

Data Collection

Describing Data Visually

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Time-Series Analysis

Chi-Square Tests

Nonparametric Tests

Quality Management

Filters

The values of x_min and x_max can be inferred accurately except in a:

The 25^th percentile for waiting time in a doctor's office is 10 minutes.The 75^th percentile is 30 minutes.Which is incorrect regarding the fences?

When applying the Empirical Rule to a distribution of grades,if a student scored one standard deviation below the mean,then she would be at the 25^th percentile of the distribution.

The 25^th percentile for waiting time in a doctor's office is 19 minutes.The 75^th percentile is 31 minutes.The interquartile range is: