Question 1

It is possible for a set of data to have multiple modes as well as multiple medians,but there can be only one mean.

Accepted Answer

A) True 
 B)False

Question 2

Based on the empirical rule we can expect about 95 percent of the values in bell-shaped distribution to be within one standard deviation of the mean.

Accepted Answer

A) True 
 B)False

Question 3

The following data reflect the number of customers who test drove new cars each day for a sample of 20 days at the Redfield Ford Dealership.   Given these data,what is the interquartile range?

Accepted Answer

A) 3 
B) 7 
C) 4 
D) 14 
A) 3 
B) 7 
C) 4 
D) 14

Question 4

A distribution is said to be symmetric when the sample mean and the population mean are equal.

Accepted Answer

A) True 
 B)False

Question 5

The Good-Guys Car Dealership has tracked the number of used cars sold at its downtown dealership.Consider the following data as representing the population of cars sold in each of the 8 weeks that the dealership has been open.   The population variance is approximately 9.43.

Accepted Answer

A) True 
 B)False

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

Consider a situation involving two populations where population 1 is known to have a higher coefficient of variation than population 2.In this situation,we know that population 1 has a higher standard deviation than population 2.

Accepted Answer

A) True 
 B)False

Question 8

Incomes in a particular market area are known to be right-skewed with a mean equal to $33,100.In a report issued recently,a manager stated that at least 89 percent of all incomes are in the range of $26,700 to $39,500,and this was based on Tchebysheff's theorem.Given these facts,what is the standard deviation for the incomes in this market area?

Accepted Answer

A) Approximately $6,400 
B) Approximately $3,200 
C) Approximately $2,133 
D) Approximately $4266 
A) Approximately $6,400 
B) Approximately $3,200 
C) Approximately $2,133 
D) Approximately $4266

Question 9

The distribution of actual weight of potato chips in a 16 ounce sack is thought to be bell-shaped with a mean equal to 16 ounces and a standard deviation equal to 0.45 ounces.Based on this,between what two limits could we expect 95 percent of all sacks to weigh?

Accepted Answer

A) 14 to 18 ounces 
B) 15.10 to 16.90 ounces 
C) 15.55 to 16.45 ounces 
D) 14.65 to 17.35 ounces 
A) 14 to 18 ounces 
B) 15.10 to 16.90 ounces 
C) 15.55 to 16.45 ounces 
D) 14.65 to 17.35 ounces

Question 10

Populations with larger means will also have larger standard deviations since the data will be more spread out for populations with larger means.

Accepted Answer

A) True 
 B)False

It is possible for a set of data to have multiple modes as well as multiple medians,but there can be only one mean.

Based on the empirical rule we can expect about 95 percent of the values in bell-shaped distribution to be within one standard deviation of the mean.

The following data reflect the number of customers who test drove new cars each day for a sample of 20 days at the Redfield Ford Dealership. Given these data,what is the interquartile range?

A distribution is said to be symmetric when the sample mean and the population mean are equal.

The Good-Guys Car Dealership has tracked the number of used cars sold at its downtown dealership.Consider the following data as representing the population of cars sold in each of the 8 weeks that the dealership has been open. The population variance is approximately 9.43.

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.

Consider a situation involving two populations where population 1 is known to have a higher coefficient of variation than population 2.In this situation,we know that population 1 has a higher standard deviation than population 2.

The distribution of actual weight of potato chips in a 16 ounce sack is thought to be bell-shaped with a mean equal to 16 ounces and a standard deviation equal to 0.45 ounces.Based on this,between what two limits could we expect 95 percent of all sacks to weigh?

Populations with larger means will also have larger standard deviations since the data will be more spread out for populations with larger means.

The Where, why, and How of Data Collection

Graphs,charts and Tablesdescribing Your Data

Using Probability and Probability Distributions

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

Introduction to Decision Analysis

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Exam 3: Describing Data Using Numerical Measures

It is possible for a set of data to have multiple modes as well as multiple medians,but there can be only one mean.

Based on the empirical rule we can expect about 95 percent of the values in bell-shaped distribution to be within one standard deviation of the mean.

The following data reflect the number of customers who test drove new cars each day for a sample of 20 days at the Redfield Ford Dealership. Given these data,what is the interquartile range?

A distribution is said to be symmetric when the sample mean and the population mean are equal.

The Good-Guys Car Dealership has tracked the number of used cars sold at its downtown dealership.Consider the following data as representing the population of cars sold in each of the 8 weeks that the dealership has been open. The population variance is approximately 9.43.

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.

Consider a situation involving two populations where population 1 is known to have a higher coefficient of variation than population 2.In this situation,we know that population 1 has a higher standard deviation than population 2.

The distribution of actual weight of potato chips in a 16 ounce sack is thought to be bell-shaped with a mean equal to 16 ounces and a standard deviation equal to 0.45 ounces.Based on this,between what two limits could we expect 95 percent of all sacks to weigh?

Populations with larger means will also have larger standard deviations since the data will be more spread out for populations with larger means.

The Where, why, and How of Data Collection

Graphs,charts and Tablesdescribing Your Data

Using Probability and Probability Distributions

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

Introduction to Decision Analysis

Filters