Question 1

When a sample has an odd number of observations,the median is the:

Accepted Answer

A)  observation in the center of the data array. 
B)  average of the two observations in the center of the data array. 
C)  value of the most frequent observation. 
D)  average of Q1 and Q3. 
A)  observation in the center of the data array. 
B)  average of the two observations in the center of the data array. 
C)  value of the most frequent observation. 
D)  average of Q1 and Q3.

Question 2

Briefly describe this sample of departure delays on American Airlines flights out of Denver over a seven-day period,March 3-9 (n = 150 flights).

Accepted Answer

Short left whisker,skewed righ

Question 3

Find the coefficient of variation of these numbers: 14,17,17,19,26.Would the variability of those numbers be greater than,less than,or the same as the variability of 24,27,27,29,36? Defend your answer.

Accepted Answer

Relative variation i

Question 4

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 2,1,5,1,1,3,4,3,1,1,5,18.For this sample,the median is:

Accepted Answer

A)  2. 
B)  3. 
C)  3.5. 
D)  2.5. 
A)  2. 
B)  3. 
C)  3.5. 
D)  2.5.

Question 5

A leptokurtic distribution is more sharply peaked (i.e. ,thinner tails)than a normal distribution.

Accepted Answer

A) True 
 B)False

Question 6

A 10-point quiz was given by Professor Ennuyeaux.Of the 10 students in the class,half got zero and the others got perfect scores.List the students' scores.Then find the mean,median,mode,and geometric mean of their scores.Which is the most appropriate measure of center? The least appropriate?

Accepted Answer

Mean is 5,median is

Question 7

A sample consists of the following data: 7,11,12,18,20,22,43.Using the "three standard deviation" criterion,the last observation (X = 43)would be considered an outlier.

Accepted Answer

A) True 
 B)False

Question 8

A trimmed mean may be preferable to a mean when a data set has extreme values.

Accepted Answer

A) True 
 B)False

Question 9

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 3,2,1,2,1,5,9,1,2,3,3,10.The geometric mean is:

Accepted Answer

A)    
B)  2.604 
C)  1.517 
D)    
A)    
B)  2.604 
C)  1.517 
D)

Question 10

Three randomly chosen Michigan students were asked how many round trips they made to Canada last year.Their replies were 3,4,5.The geometric mean is:

Accepted Answer

A)  3.877. 
B)  4.000. 
C)  3.915. 
D)  4.422. 
A)  3.877. 
B)  4.000. 
C)  3.915. 
D)  4.422.

Question 11

Referring to this box plot of ice cream fat content,the skewness would be negative.

Accepted Answer

A) True 
 B)False

Question 12

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 3,2,1,2,1,5,9,1,2,3,3,10.The median is:

Accepted Answer

A)  7.0. 
B)  3.0. 
C)  3.5. 
D)  2.5. 
A)  7.0. 
B)  3.0. 
C)  3.5. 
D)  2.5.

Question 13

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.Describe Craig's gasoline mileage based on this box plot of 195 tanks of gas.

Accepted Answer

Range is from just under 9.0 to just ove

Question 14

A data set with two values that are tied for the highest number of occurrences is called bimodal.

Accepted Answer

A) True 
 B)False

Question 15

A certain health maintenance organization (HMO)examined the number of office visits by each of its members in the last year.For this data set,we would anticipate that the geometric mean would be

Accepted Answer

A)  a reasonable measure of center. 
B)  zero because some HMO members would not have an office visit. 
C)  too high because the distribution is likely to be skewed to the left. 
D)  negative because some data values would be below the mean. 
A)  a reasonable measure of center. 
B)  zero because some HMO members would not have an office visit. 
C)  too high because the distribution is likely to be skewed to the left. 
D)  negative because some data values would be below the mean.

Question 16

In a left-skewed distribution,we expect that the median will be greater than the mean.

Accepted Answer

A) True 
 B)False

Question 17

The quartiles of a distribution are most clearly revealed in which display?

Accepted Answer

A)  Box plot 
B)  Scatter plot 
C)  Histogram 
D)  Dot plot 
A)  Box plot 
B)  Scatter plot 
C)  Histogram 
D)  Dot plot

Question 18

A national survey showed that most commuter cars contain only the driver.Hungry for a story,a campus newspaper reporter asked five randomly chosen commuter students how many occupants,including the driver,rode to school in their cars.Their responses were 1,1,1,1,and 6.The next day a story appeared in the paper headlined "University Commuters Double National Average Ridership." Is this a reasonable assessment of central tendency? How would you characterize the variability of the sample?

Accepted Answer

The mean is 2,median is 1,and

Question 19

Find the sample correlation coefficient for the following data.

Accepted Answer

A)  .8911 
B)  .9132 
C)  .9822 
D)  .9556 
A)  .8911 
B)  .9132 
C)  .9822 
D)  .9556

Question 20

Exam scores in a small class were 10,10,20,20,40,60,80,80,90,100,100.For this data set,which statement is incorrect concerning measures of center?

Accepted Answer

A)  The median is 60.00. 
B)  The mode is not helpful. 
C)  The 5 percent trimmed mean would be awkward. 
D)  The geometric mean is 35.05. 
A)  The median is 60.00. 
B)  The mode is not helpful. 
C)  The 5 percent trimmed mean would be awkward. 
D)  The geometric mean is 35.05.

When a sample has an odd number of observations,the median is the:

Briefly describe this sample of departure delays on American Airlines flights out of Denver over a seven-day period,March 3-9 (n = 150 flights).

Find the coefficient of variation of these numbers: 14,17,17,19,26.Would the variability of those numbers be greater than,less than,or the same as the variability of 24,27,27,29,36? Defend your answer.

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 2,1,5,1,1,3,4,3,1,1,5,18.For this sample,the median is:

A leptokurtic distribution is more sharply peaked (i.e. ,thinner tails)than a normal distribution.

A 10-point quiz was given by Professor Ennuyeaux.Of the 10 students in the class,half got zero and the others got perfect scores.List the students' scores.Then find the mean,median,mode,and geometric mean of their scores.Which is the most appropriate measure of center? The least appropriate?

A sample consists of the following data: 7,11,12,18,20,22,43.Using the "three standard deviation" criterion,the last observation (X = 43)would be considered an outlier.

A trimmed mean may be preferable to a mean when a data set has extreme values.

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 3,2,1,2,1,5,9,1,2,3,3,10.The geometric mean is:

Three randomly chosen Michigan students were asked how many round trips they made to Canada last year.Their replies were 3,4,5.The geometric mean is:

Referring to this box plot of ice cream fat content,the skewness would be negative.

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 3,2,1,2,1,5,9,1,2,3,3,10.The median is:

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.Describe Craig's gasoline mileage based on this box plot of 195 tanks of gas.

A data set with two values that are tied for the highest number of occurrences is called bimodal.

A certain health maintenance organization (HMO)examined the number of office visits by each of its members in the last year.For this data set,we would anticipate that the geometric mean would be

In a left-skewed distribution,we expect that the median will be greater than the mean.

The quartiles of a distribution are most clearly revealed in which display?

Find the sample correlation coefficient for the following data.

Exam scores in a small class were 10,10,20,20,40,60,80,80,90,100,100.For this data set,which statement is incorrect concerning measures of center?

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

When a sample has an odd number of observations,the median is the:

Briefly describe this sample of departure delays on American Airlines flights out of Denver over a seven-day period,March 3-9 (n = 150 flights).

Find the coefficient of variation of these numbers: 14,17,17,19,26.Would the variability of those numbers be greater than,less than,or the same as the variability of 24,27,27,29,36? Defend your answer.

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 2,1,5,1,1,3,4,3,1,1,5,18.For this sample,the median is:

A leptokurtic distribution is more sharply peaked (i.e. ,thinner tails)than a normal distribution.

A 10-point quiz was given by Professor Ennuyeaux.Of the 10 students in the class,half got zero and the others got perfect scores.List the students' scores.Then find the mean,median,mode,and geometric mean of their scores.Which is the most appropriate measure of center? The least appropriate?

A sample consists of the following data: 7,11,12,18,20,22,43.Using the "three standard deviation" criterion,the last observation (X = 43)would be considered an outlier.

A trimmed mean may be preferable to a mean when a data set has extreme values.

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 3,2,1,2,1,5,9,1,2,3,3,10.The geometric mean is:

Three randomly chosen Michigan students were asked how many round trips they made to Canada last year.Their replies were 3,4,5.The geometric mean is:

Referring to this box plot of ice cream fat content,the skewness would be negative.

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 3,2,1,2,1,5,9,1,2,3,3,10.The median is:

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.Describe Craig's gasoline mileage based on this box plot of 195 tanks of gas.

A data set with two values that are tied for the highest number of occurrences is called bimodal.

A certain health maintenance organization (HMO)examined the number of office visits by each of its members in the last year.For this data set,we would anticipate that the geometric mean would be

In a left-skewed distribution,we expect that the median will be greater than the mean.

The quartiles of a distribution are most clearly revealed in which display?

Find the sample correlation coefficient for the following data.

Exam scores in a small class were 10,10,20,20,40,60,80,80,90,100,100.For this data set,which statement is incorrect concerning measures of center?

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