Question 1

Under what circumstances is it necessary to use the coefficient of variation to compare relative variability between two or more distributions?

Accepted Answer

A) When the means of the distributions are equal 
B) When the means of the distributions are not equal 
C) When the standard deviations of the distributions are not equal 
D) When the standard deviations of the distributions are equal 
A) When the means of the distributions are equal 
B) When the means of the distributions are not equal 
C) When the standard deviations of the distributions are not equal 
D) When the standard deviations of the distributions are equal

Question 2

When surveyed,a sample of 1,250 patients at a regional hospital provided interviewers with the following summary statistics pertaining to the hospital charges:
Minimum = $278.00 Q1 = $1,245 Q2 = $3,567 Q3= $4,702.
Based on these data,the distribution is seen to be symmetric.

Accepted Answer

A) True 
 B)False

Question 3

You are given the following data:
   Assuming that the data reflect a sample from a larger population,the sample mean is 30.00.

Accepted Answer

A) True 
 B)False

Question 4

The asking price for homes on the real estate market in Baltimore has a mean value of $286,455 and a standard deviation of $11,200.The mean and standard deviation in asking price for homes in Denver are $188,468 and $8,230,respectively.Recently,one home sold in each city where the asking price for each home was $193,000.Assuming that both distributions are bell-shaped,which of the following statements is true?

Accepted Answer

A) The Baltimore home has the higher standard z-value. 
B) The coefficient of variation for Denver is less than for Baltimore. 
C) The Denver home has a higher standard z-value. 
D) Both cities have the same coefficient of variation. 
A) The Baltimore home has the higher standard z-value. 
B) The coefficient of variation for Denver is less than for Baltimore. 
C) The Denver home has a higher standard z-value. 
D) Both cities have the same coefficient of variation.

Question 5

The following sample data reflect electricity bills for ten households in San Diego in March.
   Determine three measures of central tendency for these sample data.Then,based on these measures,determine whether the sample data are symmetric or skewed.

Accepted Answer

The three measures of central tendency a

Question 6

The owner of a local gasoline station has kept track of the number of gallons of regular unleaded sold at his station every day since he purchased the station.This morning,he computed the mean number of gallons.This value would be considered a statistic.

Accepted Answer

A) True 
 B)False

Question 7

A set of data is considered to be symmetric if the 3rd quartile is three times larger than the 1st quartile.

Accepted Answer

A) True 
 B)False

Question 8

You are given the following data:
   Assuming that these data are a sample selected from a larger population,the median value for these sample data is 25.5.

Accepted Answer

A) True 
 B)False

Question 9

A recent study involving a sample of 3,000 vehicles in California showed the following statistics related to the number of miles driven per day: Q1 = 12,Q2 = 45,and Q3 = 56.Based on these data,if a box and whisker plot is developed,a value of 110 is an outlier.

Accepted Answer

A) True 
 B)False

Question 10

Explain how Tchebysheff's theorem can be used to help describe data in a population or a sample.

Accepted Answer

If the data in a sample or a population

Question 11

The sample mean is an estimate of μ and may be either higher or lower than μ depending on the sample.

Accepted Answer

A) True 
 B)False

Question 12

If a set of data has 540 values,the 3rd quartile corresponds to approximately the 135th value when the data have been arranged in numerical order.

Accepted Answer

A) True 
 B)False

Question 13

You are given the following data:
   Assuming that these data reflect the population of interest,these data can be considered symmetric.

Accepted Answer

A) True 
 B)False

Question 14

A small company has 7 employees.The numbers of years these employees have worked for this company are shown as follows:   Based upon this information,the median number of years that employees have been with this company is:

Accepted Answer

A) 9 years. 
B) 16 years. 
C) 10 years. 
D) 14 years. 
A) 9 years. 
B) 16 years. 
C) 10 years. 
D) 14 years.

Question 15

Suppose the standard deviation for a given sample is known to be 20.If the data in the sample are doubled,the standard deviation will be 40.

Accepted Answer

A) True 
 B)False

Question 16

Consider the following data,which represent the number of miles that employees commute from home to work each day.There are two samples: one for males and one for females. Males:
  Females:
  Which of the following statements is true?

Accepted Answer

A) Females have the larger mean. 
B) The coefficient of variation is larger for females than for males. 
C) The coefficient of variation is larger for males than for females. 
D) Females have the larger range. 
A) Females have the larger mean. 
B) The coefficient of variation is larger for females than for males. 
C) The coefficient of variation is larger for males than for females. 
D) Females have the larger range.

Question 17

For ordinal data,________ is the preferred measure of central location.

Accepted Answer

A) the mean 
B) the median 
C) the percentile 
D) the quartile 
A) the mean 
B) the median 
C) the percentile 
D) the quartile

Question 18

You are given the following data:
   Assuming that the data reflect the population of interest,the mean of the population is 36.00.

Accepted Answer

A) True 
 B)False

Question 19

At a sawmill in Oregon,a process improvement team measured the diameters for a sample of 1,500 logs.The following summary statistics were computed:   Given this information,for a box and whisker plot which of the following statements is appropriate?

Accepted Answer

A) Seventy-five percent of the trees in the sample have values between 8.9 in.and 15.6 in. 
B) Virtually all of the data should fall between 0 in.and 25.65 in. 
C) No tree will have a diameter of more than 22.3 in. 
D) Fifty percent of the trees will have diameters between 13.5 in.and 15.6 in. 
A) Seventy-five percent of the trees in the sample have values between 8.9 in.and 15.6 in. 
B) Virtually all of the data should fall between 0 in.and 25.65 in. 
C) No tree will have a diameter of more than 22.3 in. 
D) Fifty percent of the trees will have diameters between 13.5 in.and 15.6 in.

Question 20

The advantage of using the interquartile range as a measure of variation is that it utilizes all the data in its computation.

Accepted Answer

A) True 
 B)False

Under what circumstances is it necessary to use the coefficient of variation to compare relative variability between two or more distributions?

When surveyed,a sample of 1,250 patients at a regional hospital provided interviewers with the following summary statistics pertaining to the hospital charges: Minimum = $278.00 Q1 = $1,245 Q2 = $3,567 Q3= $4,702. Based on these data,the distribution is seen to be symmetric.

You are given the following data: Assuming that the data reflect a sample from a larger population,the sample mean is 30.00.

The following sample data reflect electricity bills for ten households in San Diego in March. Determine three measures of central tendency for these sample data.Then,based on these measures,determine whether the sample data are symmetric or skewed.

The owner of a local gasoline station has kept track of the number of gallons of regular unleaded sold at his station every day since he purchased the station.This morning,he computed the mean number of gallons.This value would be considered a statistic.

A set of data is considered to be symmetric if the 3^rd quartile is three times larger than the 1^st quartile.

You are given the following data: Assuming that these data are a sample selected from a larger population,the median value for these sample data is 25.5.

A recent study involving a sample of 3,000 vehicles in California showed the following statistics related to the number of miles driven per day: Q1 = 12,Q2 = 45,and Q3 = 56.Based on these data,if a box and whisker plot is developed,a value of 110 is an outlier.

Explain how Tchebysheff's theorem can be used to help describe data in a population or a sample.

The sample mean is an estimate of μ and may be either higher or lower than μ depending on the sample.

If a set of data has 540 values,the 3^rd quartile corresponds to approximately the 135^th value when the data have been arranged in numerical order.

You are given the following data: Assuming that these data reflect the population of interest,these data can be considered symmetric.

A small company has 7 employees.The numbers of years these employees have worked for this company are shown as follows: Based upon this information,the median number of years that employees have been with this company is:

Suppose the standard deviation for a given sample is known to be 20.If the data in the sample are doubled,the standard deviation will be 40.

Consider the following data,which represent the number of miles that employees commute from home to work each day.There are two samples: one for males and one for females. Males: Females: Which of the following statements is true?

For ordinal data,________ is the preferred measure of central location.

You are given the following data: Assuming that the data reflect the population of interest,the mean of the population is 36.00.

At a sawmill in Oregon,a process improvement team measured the diameters for a sample of 1,500 logs.The following summary statistics were computed: Given this information,for a box and whisker plot which of the following statements is appropriate?

The advantage of using the interquartile range as a measure of variation is that it utilizes all the data in its computation.

The Where,Why,and How of Data Collection

Graphs,Charts and Tablesdescribing Your Data

Introduction to Probability

Discrete Probability Distributions

Introduction to Continuous Probability Distributions

Introduction to Sampling Distributions

Estimating Single Population Parameters

Introduction to Hypothesis Testing

Estimation and Hypothesis Testing for Two Population Parameters

Hypothesis Tests and Estimation for Population Variances

Analysis of Variance

Goodness-Of-Fit Tests and Contingency Analysis

Introduction to Linear Regression and Correlation Analysis

Multiple Regression Analysis and Model Building

Analyzing and Forecasting Time-Series Data

Introduction to Nonparametric Statistics

Introduction to Quality and Statistical Process Control

Filters

Exam 3: Describing Data Using Numerical Measures

Under what circumstances is it necessary to use the coefficient of variation to compare relative variability between two or more distributions?

When surveyed,a sample of 1,250 patients at a regional hospital provided interviewers with the following summary statistics pertaining to the hospital charges: Minimum = $278.00 Q1 = $1,245 Q2 = $3,567 Q3= $4,702. Based on these data,the distribution is seen to be symmetric.

You are given the following data: Assuming that the data reflect a sample from a larger population,the sample mean is 30.00.

The following sample data reflect electricity bills for ten households in San Diego in March. Determine three measures of central tendency for these sample data.Then,based on these measures,determine whether the sample data are symmetric or skewed.

The owner of a local gasoline station has kept track of the number of gallons of regular unleaded sold at his station every day since he purchased the station.This morning,he computed the mean number of gallons.This value would be considered a statistic.

A set of data is considered to be symmetric if the 3rd quartile is three times larger than the 1st quartile.

You are given the following data: Assuming that these data are a sample selected from a larger population,the median value for these sample data is 25.5.

A recent study involving a sample of 3,000 vehicles in California showed the following statistics related to the number of miles driven per day: Q1 = 12,Q2 = 45,and Q3 = 56.Based on these data,if a box and whisker plot is developed,a value of 110 is an outlier.

Explain how Tchebysheff's theorem can be used to help describe data in a population or a sample.

The sample mean is an estimate of μ and may be either higher or lower than μ depending on the sample.

If a set of data has 540 values,the 3rd quartile corresponds to approximately the 135th value when the data have been arranged in numerical order.

You are given the following data: Assuming that these data reflect the population of interest,these data can be considered symmetric.

A small company has 7 employees.The numbers of years these employees have worked for this company are shown as follows: Based upon this information,the median number of years that employees have been with this company is:

Suppose the standard deviation for a given sample is known to be 20.If the data in the sample are doubled,the standard deviation will be 40.

Consider the following data,which represent the number of miles that employees commute from home to work each day.There are two samples: one for males and one for females. Males: Females: Which of the following statements is true?

For ordinal data,________ is the preferred measure of central location.

You are given the following data: Assuming that the data reflect the population of interest,the mean of the population is 36.00.

At a sawmill in Oregon,a process improvement team measured the diameters for a sample of 1,500 logs.The following summary statistics were computed: Given this information,for a box and whisker plot which of the following statements is appropriate?

The advantage of using the interquartile range as a measure of variation is that it utilizes all the data in its computation.

The Where,Why,and How of Data Collection

Graphs,Charts and Tablesdescribing Your Data

Introduction to Probability

Discrete Probability Distributions

Introduction to Continuous Probability Distributions

Introduction to Sampling Distributions

Estimating Single Population Parameters

Introduction to Hypothesis Testing

Estimation and Hypothesis Testing for Two Population Parameters

Hypothesis Tests and Estimation for Population Variances

Analysis of Variance

Goodness-Of-Fit Tests and Contingency Analysis

Introduction to Linear Regression and Correlation Analysis

Multiple Regression Analysis and Model Building

Analyzing and Forecasting Time-Series Data

Introduction to Nonparametric Statistics

Introduction to Quality and Statistical Process Control

Filters

A set of data is considered to be symmetric if the 3^rd quartile is three times larger than the 1^st quartile.

If a set of data has 540 values,the 3^rd quartile corresponds to approximately the 135^th value when the data have been arranged in numerical order.