Question 1

Which continuous variable is least likely to be skewed to the right by high values?

Accepted Answer

A)  Annual incomes of n passengers on a flight from New York to London 
B)  Weekend gambling losses of n customers at a major casino 
C)  Accident damage losses by n renters of an auto rental company 
D)  Cost of a plain McDonald's hamburger in n U.S.cities 
A)  Annual incomes of n passengers on a flight from New York to London 
B)  Weekend gambling losses of n customers at a major casino 
C)  Accident damage losses by n renters of an auto rental company 
D)  Cost of a plain McDonald's hamburger in n U.S.cities

Question 2

Twelve students were asked how many credit cards they owned.The responses were 0,0,1,2,2,3,3,4,4,5,5,11.(a)Find the mean,median,and mode.(b)Which measure of center seems best in this case? (c)Find the first and third quartiles.What do they tell you?

Accepted Answer

(a)Mean is 3.33,median is 3,mo

Question 3

The following table is the frequency distribution of parking fees for a day:   The mean parking fee is:

Accepted Answer

A)  $7.07. 
B)  $6.95. 
C)  $7.00. 
D)  $7.25. 
A)  $7.07. 
B)  $6.95. 
C)  $7.00. 
D)  $7.25.

Question 4

Which is not a measure of variability?

Accepted Answer

A)  Mean absolute deviation (MA
D)  
B)  Range 
C)  Coefficient of variation 
D)  Trimmed mean 
A)  Mean absolute deviation (MA
D)  
B)  Range 
C)  Coefficient of variation 
D)  Trimmed mean

Question 5

When data are right-skewed,we expect the median to be greater than the mean.

Accepted Answer

A) True 
 B)False

Question 6

Six graduates from Fulsome University's Master's of Waste Management program were hired by a Saudi Arabian firm at $110,000 each,while the other four graduates were unemployed.The university placement office bragged,"Our MWM graduates enjoyed a median starting salary of $110,000." Is this a reasonable assessment of central tendency? What are the alternatives?

Accepted Answer

Can't use geometric

Question 7

Which is not an advantage of the method of medians to find Q1 and Q3?

Accepted Answer

A)  Ease of interpolating quartile positions. 
B)  Ease of application in small data sets. 
C)  Intuitive definitions without complex formulas. 
D)  Same method as Excel's =QUARTILE.EXC function. 
A)  Ease of interpolating quartile positions. 
B)  Ease of application in small data sets. 
C)  Intuitive definitions without complex formulas. 
D)  Same method as Excel's =QUARTILE.EXC function.

Question 8

If there are 20 data values,the median will be halfway between two data values.

Accepted Answer

A) True 
 B)False

Question 9

Three randomly chosen Colorado students were asked how many times they went rock climbing last month.Their replies were 5,6,7.The standard deviation is:

Accepted Answer

A)  1.212. 
B)  0.816. 
C)  1.000. 
D)  1.056. 
A)  1.212. 
B)  0.816. 
C)  1.000. 
D)  1.056.

Question 10

The 25th percentile for waiting time in a doctor's office is 19 minutes.The 75th percentile is 31 minutes.Which is incorrect regarding the fences?

Accepted Answer

A)  The upper inner fence is 49 minutes. 
B)  The upper outer fence is 67 minutes. 
C)  A waiting time of 45 minutes exceeds the upper inner fence. 
D)  A waiting time of 70 minutes would be an outlier. 
A)  The upper inner fence is 49 minutes. 
B)  The upper outer fence is 67 minutes. 
C)  A waiting time of 45 minutes exceeds the upper inner fence. 
D)  A waiting time of 70 minutes would be an outlier.

Question 11

Eleven students were asked how many siblings they had.The responses were 0,1,2,2,2,2,2,3,3,4,5.Find the mean,median,mode,and geometric mean.Which would you prefer in this case,and why not the others?

Accepted Answer

Mean is 2.

Question 12

A reporter for the campus paper asked five randomly chosen students how many occupants,including the driver,ride to school in their cars.The responses were 1,1,1,1,6.The coefficient of variation is:

Accepted Answer

A)  25 percent. 
B)  250 percent. 
C)  112 percent. 
D)  100 percent. 
A)  25 percent. 
B)  250 percent. 
C)  112 percent. 
D)  100 percent.

Question 13

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.This box plot of Craig's MPG on 195 tanks of gas does not support which statement?

Accepted Answer

A)  There are several outliers. 
B)  This is a very right-skewed distribution. 
C)  Most MPG values are concentrated in a narrow range. 
D)  The interquartile range is less than 2 MPG. 
A)  There are several outliers. 
B)  This is a very right-skewed distribution. 
C)  Most MPG values are concentrated in a narrow range. 
D)  The interquartile range is less than 2 MPG.

Question 14

Outliers are data values that fall beyond ±2 standard deviations from the mean.

Accepted Answer

A) True 
 B)False

Question 15

A certain health maintenance organization (HMO)examined the number of office visits by its members in the last year.For this data set,the mean is probably not a very good measure of a "typical" person's office visits.

Accepted Answer

A) True 
 B)False

Question 16

The Excel formula for the standard deviation of a sample array named Data is:

Accepted Answer

A)  =STDEV.S(Data). 
B)  =STANDEV(Data). 
C)  =STDEV.P(Data). 
D)  =SUM(Data)/(COUNT(Data)-1). 
A)  =STDEV.S(Data). 
B)  =STANDEV(Data). 
C)  =STDEV.P(Data). 
D)  =SUM(Data)/(COUNT(Data)-1).

Question 17

Heights of male students in a certain statistics class range from Xmin = 61 to Xmax = 79.Applying the Empirical Rule,a reasonable estimate of σ would be:

Accepted Answer

A)  2.75. 
B)  3.00. 
C)  3.25. 
D)  3.50. 
A)  2.75. 
B)  3.00. 
C)  3.25. 
D)  3.50.

Question 18

Frieda is 67 inches tall and weighs 135 pounds.Women her age have a mean height of 65 inches with a standard deviation of 2.5 inches and a mean weight of 125 pounds with a standard deviation of 10 pounds.In relative terms,it is correct to say that:

Accepted Answer

A)  Frieda is taller and thinner than women in her age group. 
B)  for this group of women,weight has greater variation than height. 
C)  Frieda's height is more unusual than her weight. 
D)  the variation coefficient exceeds 10 percent for both height and weight. 
A)  Frieda is taller and thinner than women in her age group. 
B)  for this group of women,weight has greater variation than height. 
C)  Frieda's height is more unusual than her weight. 
D)  the variation coefficient exceeds 10 percent for both height and weight.

Question 19

Which is true of skewness?

Accepted Answer

A)  In business data,positive skewness is unusual. 
B)  In a negatively skewed distribution,the mean is likely to exceed the median. 
C)  Skewness often is evidenced by one or more outliers. 
D)  The expected range of Excel's skewness coefficient increases as n increases. 
A)  In business data,positive skewness is unusual. 
B)  In a negatively skewed distribution,the mean is likely to exceed the median. 
C)  Skewness often is evidenced by one or more outliers. 
D)  The expected range of Excel's skewness coefficient increases as n increases.

Question 20

Which Excel function is designed to calculate z =(x - μ)/σ for a column of data?

Accepted Answer

A)  =STANDARDIZE 
B)  =NORM.DIST 
C)  =STDEV.P 
D)  =AVEDEV 
A)  =STANDARDIZE 
B)  =NORM.DIST 
C)  =STDEV.P 
D)  =AVEDEV

Which continuous variable is least likely to be skewed to the right by high values?

Twelve students were asked how many credit cards they owned.The responses were 0,0,1,2,2,3,3,4,4,5,5,11.(a)Find the mean,median,and mode.(b)Which measure of center seems best in this case? (c)Find the first and third quartiles.What do they tell you?

The following table is the frequency distribution of parking fees for a day: The mean parking fee is:

Which is not a measure of variability?

When data are right-skewed,we expect the median to be greater than the mean.

Which is not an advantage of the method of medians to find Q₁ and Q₃?

If there are 20 data values,the median will be halfway between two data values.

Three randomly chosen Colorado students were asked how many times they went rock climbing last month.Their replies were 5,6,7.The standard deviation is:

The 25^th percentile for waiting time in a doctor's office is 19 minutes.The 75^th percentile is 31 minutes.Which is incorrect regarding the fences?

Eleven students were asked how many siblings they had.The responses were 0,1,2,2,2,2,2,3,3,4,5.Find the mean,median,mode,and geometric mean.Which would you prefer in this case,and why not the others?

A reporter for the campus paper asked five randomly chosen students how many occupants,including the driver,ride to school in their cars.The responses were 1,1,1,1,6.The coefficient of variation is:

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.This box plot of Craig's MPG on 195 tanks of gas does not support which statement?

Outliers are data values that fall beyond ±2 standard deviations from the mean.

A certain health maintenance organization (HMO)examined the number of office visits by its members in the last year.For this data set,the mean is probably not a very good measure of a "typical" person's office visits.

The Excel formula for the standard deviation of a sample array named Data is:

Heights of male students in a certain statistics class range from X_min = 61 to X_max = 79.Applying the Empirical Rule,a reasonable estimate of σ would be:

Frieda is 67 inches tall and weighs 135 pounds.Women her age have a mean height of 65 inches with a standard deviation of 2.5 inches and a mean weight of 125 pounds with a standard deviation of 10 pounds.In relative terms,it is correct to say that:

Which is true of skewness?

Which Excel function is designed to calculate z =(x - μ)/σ for a column of data?

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

Which continuous variable is least likely to be skewed to the right by high values?

Twelve students were asked how many credit cards they owned.The responses were 0,0,1,2,2,3,3,4,4,5,5,11.(a)Find the mean,median,and mode.(b)Which measure of center seems best in this case? (c)Find the first and third quartiles.What do they tell you?

The following table is the frequency distribution of parking fees for a day: The mean parking fee is:

Which is not a measure of variability?

When data are right-skewed,we expect the median to be greater than the mean.

Which is not an advantage of the method of medians to find Q1 and Q3?

If there are 20 data values,the median will be halfway between two data values.

Three randomly chosen Colorado students were asked how many times they went rock climbing last month.Their replies were 5,6,7.The standard deviation is:

The 25th percentile for waiting time in a doctor's office is 19 minutes.The 75th percentile is 31 minutes.Which is incorrect regarding the fences?

Eleven students were asked how many siblings they had.The responses were 0,1,2,2,2,2,2,3,3,4,5.Find the mean,median,mode,and geometric mean.Which would you prefer in this case,and why not the others?

A reporter for the campus paper asked five randomly chosen students how many occupants,including the driver,ride to school in their cars.The responses were 1,1,1,1,6.The coefficient of variation is:

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.This box plot of Craig's MPG on 195 tanks of gas does not support which statement?

Outliers are data values that fall beyond ±2 standard deviations from the mean.

A certain health maintenance organization (HMO)examined the number of office visits by its members in the last year.For this data set,the mean is probably not a very good measure of a "typical" person's office visits.

The Excel formula for the standard deviation of a sample array named Data is:

Heights of male students in a certain statistics class range from Xmin = 61 to Xmax = 79.Applying the Empirical Rule,a reasonable estimate of σ would be:

Frieda is 67 inches tall and weighs 135 pounds.Women her age have a mean height of 65 inches with a standard deviation of 2.5 inches and a mean weight of 125 pounds with a standard deviation of 10 pounds.In relative terms,it is correct to say that:

Which is true of skewness?

Which Excel function is designed to calculate z =(x - μ)/σ for a column of data?

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

Which is not an advantage of the method of medians to find Q₁ and Q₃?

The 25^th percentile for waiting time in a doctor's office is 19 minutes.The 75^th percentile is 31 minutes.Which is incorrect regarding the fences?

Heights of male students in a certain statistics class range from X_min = 61 to X_max = 79.Applying the Empirical Rule,a reasonable estimate of σ would be: