Question 1

Skewness and kurtosis of a data set are measures of the shape of the distribution.

Accepted Answer

A) True 
 B)False

Question 2

Jessica Salas, President of Salas Products, is reviewing the warranty policy for her company's new model of automobile batteries.Life tests performed on a sample of 100 batteries indicated: (1)an average life of 75 months, (2)a standard deviation of 5 months, and (3)a bell shaped battery life distribution.What percentage of the batteries will fail within the first 65 months of use?

Accepted Answer

A) 0.5% 
B) 1% 
C) 2.5% 
D) 5% 
E) 7.5% 
A) 0.5% 
B) 1% 
C) 2.5% 
D) 5% 
E) 7.5%

Question 3

Jessica Salas, President of Salas Products, is reviewing the warranty policy for her company's new model of automobile batteries.Life tests performed on a sample of 100 batteries indicated: (1)an average life of 75 months, (2)a standard deviation of 5 months, and (3)a bell shaped battery life distribution.Approximately 99.7% of the batteries will last between ___.

Accepted Answer

A) 70 and 80 months 
B) 60 and 90 months 
C) 65 and 85 months 
D) 55 and 95 months 
E) 50 and 100 months 
A) 70 and 80 months 
B) 60 and 90 months 
C) 65 and 85 months 
D) 55 and 95 months 
E) 50 and 100 months

Question 4

A company is reviewing the database of customer purchases over the past 3 years.Using descriptive statistics on this large data set, a business analyst found the following values.   From this we can conclude that,

Accepted Answer

A) 68% of these purchases are between $105.24 and $74.88 
B) The distribution of these purchases is negatively skewed 
C) 50% of these purchases are between $105.21 and $117.23 
D) 50% of these purchases are less than $105.24 
E) More of these purchases were below the mean than above the mean 
A) 68% of these purchases are between $105.24 and $74.88 
B) The distribution of these purchases is negatively skewed 
C) 50% of these purchases are between $105.21 and $117.23 
D) 50% of these purchases are less than $105.24 
E) More of these purchases were below the mean than above the mean

Question 5

The following twelve sample data values, with a mean value of 337, are provided:   The sample standard deviation is _____

Accepted Answer

A) 17.58 
B) 174.67 
C) 182.44 
D) 1070.12 
E) 1117.70 
A) 17.58 
B) 174.67 
C) 182.44 
D) 1070.12 
E) 1117.70

Skewness and kurtosis of a data set are measures of the shape of the distribution.

A company is reviewing the database of customer purchases over the past 3 years.Using descriptive statistics on this large data set, a business analyst found the following values. From this we can conclude that,

The following twelve sample data values, with a mean value of 337, are provided: The sample standard deviation is _____

Introduction to Statistics

Charts and Graphs

Probability

Discrete Distributions

Continuous Distributions

Sampling and Sampling Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

Analysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters

Exam 3: Descriptive Statistics

Skewness and kurtosis of a data set are measures of the shape of the distribution.

A company is reviewing the database of customer purchases over the past 3 years.Using descriptive statistics on this large data set, a business analyst found the following values. From this we can conclude that,

The following twelve sample data values, with a mean value of 337, are provided: The sample standard deviation is _____

Introduction to Statistics

Charts and Graphs

Probability

Discrete Distributions

Continuous Distributions

Sampling and Sampling Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

Analysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters