Question 1

From a sample of 25 items,a sample standard deviation of 4.56 ounces was just measured.What value should be used for the population standard deviation?

Accepted Answer

A) 0.91 ounces 
B) 4.56 ounces 
C) none,since the population standard deviation cannot be estimated 
D) 0.18 ounces 
A) 0.91 ounces 
B) 4.56 ounces 
C) none,since the population standard deviation cannot be estimated 
D) 0.18 ounces

Question 2

Find the standard error of the mean when the population standard deviation is 0.7 and a sample of size 50 is taken.

Accepted Answer

A) 0.099 
B) 0.014 
C) 0.028 
D) 7.14 
A) 0.099 
B) 0.014 
C) 0.028 
D) 7.14

Question 3

What is the value of the central limit theorem to statistical analyses?

Accepted Answer

The central limit theorem states that if

Question 4

Find the sample variance for the following values:
9,8,7,6,11,10,9,14,13,12,11,10

Accepted Answer

5.636,found by calcu

Question 5

For a sample size of 172,the degrees of freedom are ________.

Accepted Answer

A) 172 
B) 171 
C) 13.11 
D) 173 
A) 172 
B) 171 
C) 13.11 
D) 173

Question 6

Regarding the standard error of the mean,________.

Accepted Answer

A) as the sample size increases,the standard error increases 
B) as the sample size decreases,the standard error decreases 
C) as the sample size increases,the standard error decreases 
D) it is defined as one-half of the population standard deviation 
A) as the sample size increases,the standard error increases 
B) as the sample size decreases,the standard error decreases 
C) as the sample size increases,the standard error decreases 
D) it is defined as one-half of the population standard deviation

Question 7

A sample of fifteen 2-liter bottles of a soft drink delivers a mean weight of 2009 milliliters with a sample standard deviation of 11 milliliters.The quality assurance department wants to determine if there is a true fill problem,so they determine the confidence interval at 95% confidence to be ________.

Accepted Answer

A) 1998 to 2020 ml 
B) 2008.82 to 2009.18 ml 
C) 2003.43 to 2104.57 ml 
D) 2000.14 to 2017.86 ml 
A) 1998 to 2020 ml 
B) 2008.82 to 2009.18 ml 
C) 2003.43 to 2104.57 ml 
D) 2000.14 to 2017.86 ml

Question 8

All of the following are true about the sampling distribution of the mean except ________.

Accepted Answer

A) the population standard deviation can be determined when a large sample size is used 
B) the standard deviation of this distribution is called the standard error of the mean 
C) when larger sample sizes are used for this distribution,the sampling error is less 
D) this distribution approaches the normal distribution if the sample size is large enough 
A) the population standard deviation can be determined when a large sample size is used 
B) the standard deviation of this distribution is called the standard error of the mean 
C) when larger sample sizes are used for this distribution,the sampling error is less 
D) this distribution approaches the normal distribution if the sample size is large enough

Question 9

Which of the following distributions is most likely to approach a normal distribution?

Accepted Answer

A) distribution of all possible sample means of sample size 90 
B) distribution of all possible sample means of sample size 60 
C) distribution of all possible sample means of sample size 120 
D) distribution of all possible sample means of sample size 30 
A) distribution of all possible sample means of sample size 90 
B) distribution of all possible sample means of sample size 60 
C) distribution of all possible sample means of sample size 120 
D) distribution of all possible sample means of sample size 30

Question 10

The degrees of freedom correspond to ________.

Accepted Answer

A) the number of sample values that are inaccurate 
B) the number of population values accurately estimated by the sample values 
C) the number of sample values that are free to vary 
D) the explicit estimate of the variance 
A) the number of sample values that are inaccurate 
B) the number of population values accurately estimated by the sample values 
C) the number of sample values that are free to vary 
D) the explicit estimate of the variance

Question 11

A point estimate is used ________.

Accepted Answer

A) because it's easier to use all the values in the data set than a single value 
B) to estimate the value of a population estimate 
C) when the population parameter is known 
D) only when the population proportion is not known 
A) because it's easier to use all the values in the data set than a single value 
B) to estimate the value of a population estimate 
C) when the population parameter is known 
D) only when the population proportion is not known

Question 12

What are the three components contributing to the margin of error for a sample taken from a finite population?

Accepted Answer

The three components of the ma

Question 13

An example of a confidence interval is ________.

Accepted Answer

A) A Wall Street Journal poll reports that 45% - 48% of farmers produce grains 
B) A New York Times survey states that more than 65% of American families own their own homes 
C) A Gallup poll reports that 56% ± 3% of voters support candidate A 
D) An editorial in Smart Money magazine states that the President is confident he will be re-elected 
A) A Wall Street Journal poll reports that 45% - 48% of farmers produce grains 
B) A New York Times survey states that more than 65% of American families own their own homes 
C) A Gallup poll reports that 56% ± 3% of voters support candidate A 
D) An editorial in Smart Money magazine states that the President is confident he will be re-elected

Question 14

The basic difference between subjective and probabilistic sampling methods is whether ________.

Accepted Answer

A) the data collected is qualitative or quantitative 
B) a random procedure is used or not 
C) a person or object is being sampled 
D) actual measurements are being taken or estimates are being used 
A) the data collected is qualitative or quantitative 
B) a random procedure is used or not 
C) a person or object is being sampled 
D) actual measurements are being taken or estimates are being used

Question 15

As the confidence interval becomes wider,the likelihood that the population mean ________.

Accepted Answer

A) will be contained in that interval decreases 
B) will be in that interval is unchanged 
C) will be contained in that interval increases 
D) will be in the interval becomes irrelevant 
A) will be contained in that interval decreases 
B) will be in that interval is unchanged 
C) will be contained in that interval increases 
D) will be in the interval becomes irrelevant

Question 16

There is virtually no difference between t-values and their corresponding z-values when the sample size is greater than ________.

Accepted Answer

A) 1000 
B) 100 
C) 30 
D) 12 
A) 1000 
B) 100 
C) 30 
D) 12

Question 17

In order to ensure that a proper sample size is employed for confidence intervals,it would be best to ________.

Accepted Answer

A) take an initial sample to estimate the population mean and then use that to estimate the best sample size 
B) take an initial sample to estimate the population standard deviation and use that estimate to determine the required sample size 
C) double the sample size that was originally proposed 
D) always use a sample size of 30 
A) take an initial sample to estimate the population mean and then use that to estimate the best sample size 
B) take an initial sample to estimate the population standard deviation and use that estimate to determine the required sample size 
C) double the sample size that was originally proposed 
D) always use a sample size of 30

Question 18

Given that σ is the standard deviation of the population,n is the sample size,and   is the population mean,the standard error of the mean is calculated by ________.

Accepted Answer

A) σ   
B)    
C)    
D)    
A) σ   
B)    
C)    
D)

Question 19

The confidence interval for standard deviation is different than that for mean in that the point estimate for the standard deviation ________.

Accepted Answer

A) is calculated as plus or minus the standard error. 
B) is closer to the left endpoint of the confidence interval. 
C) is the square of the point estimate for the variance. 
D) is closer to the right endpoint of the confidence interval. 
A) is calculated as plus or minus the standard error. 
B) is closer to the left endpoint of the confidence interval. 
C) is the square of the point estimate for the variance. 
D) is closer to the right endpoint of the confidence interval.

Question 20

All of the following are reasons why random sampling is important for statistical applications except ________.

Accepted Answer

A) the outcomes are more readily understood and therefore really usable 
B) solving using mathematics alone may be very difficult if not impossible 
C) the outcome variables are complicated functions of several input random variables 
D) sampling experiments can be used to better understand important statistics theories 
A) the outcomes are more readily understood and therefore really usable 
B) solving using mathematics alone may be very difficult if not impossible 
C) the outcome variables are complicated functions of several input random variables 
D) sampling experiments can be used to better understand important statistics theories

From a sample of 25 items,a sample standard deviation of 4.56 ounces was just measured.What value should be used for the population standard deviation?

Find the standard error of the mean when the population standard deviation is 0.7 and a sample of size 50 is taken.

What is the value of the central limit theorem to statistical analyses?

Find the sample variance for the following values: 9,8,7,6,11,10,9,14,13,12,11,10

For a sample size of 172,the degrees of freedom are ________.

Regarding the standard error of the mean,________.

All of the following are true about the sampling distribution of the mean except ________.

Which of the following distributions is most likely to approach a normal distribution?

The degrees of freedom correspond to ________.

A point estimate is used ________.

What are the three components contributing to the margin of error for a sample taken from a finite population?

An example of a confidence interval is ________.

The basic difference between subjective and probabilistic sampling methods is whether ________.

As the confidence interval becomes wider,the likelihood that the population mean ________.

There is virtually no difference between t-values and their corresponding z-values when the sample size is greater than ________.

In order to ensure that a proper sample size is employed for confidence intervals,it would be best to ________.

Given that σ is the standard deviation of the population,n is the sample size,and is the population mean,the standard error of the mean is calculated by ________.

The confidence interval for standard deviation is different than that for mean in that the point estimate for the standard deviation ________.

All of the following are reasons why random sampling is important for statistical applications except ________.

Data and Business Decisions

Descriptive Statistics and Data Analysis

Probability Concepts and Distributions

Hypothesis Testing and Statistical Inference

Regression Analysis

Forecasting

Introduction to Statistical Quality Control

Building and Using Decision Models

Decision Models With Uncertainty and Risk

Decisions, uncertainty, and Risk

Queues and Process Simulation Modeling

Linear Optimization

Integer, nonlinear, and Advanced Optimization Methods

Filters

Exam 4: Sampling and Estimation

From a sample of 25 items,a sample standard deviation of 4.56 ounces was just measured.What value should be used for the population standard deviation?

Find the standard error of the mean when the population standard deviation is 0.7 and a sample of size 50 is taken.

What is the value of the central limit theorem to statistical analyses?

Find the sample variance for the following values: 9,8,7,6,11,10,9,14,13,12,11,10

For a sample size of 172,the degrees of freedom are ________.

Regarding the standard error of the mean,________.

All of the following are true about the sampling distribution of the mean except ________.

Which of the following distributions is most likely to approach a normal distribution?

The degrees of freedom correspond to ________.

A point estimate is used ________.

What are the three components contributing to the margin of error for a sample taken from a finite population?

An example of a confidence interval is ________.

The basic difference between subjective and probabilistic sampling methods is whether ________.

As the confidence interval becomes wider,the likelihood that the population mean ________.

There is virtually no difference between t-values and their corresponding z-values when the sample size is greater than ________.

In order to ensure that a proper sample size is employed for confidence intervals,it would be best to ________.

Given that σ is the standard deviation of the population,n is the sample size,and is the population mean,the standard error of the mean is calculated by ________.

The confidence interval for standard deviation is different than that for mean in that the point estimate for the standard deviation ________.

All of the following are reasons why random sampling is important for statistical applications except ________.

Data and Business Decisions

Descriptive Statistics and Data Analysis

Probability Concepts and Distributions

Hypothesis Testing and Statistical Inference

Regression Analysis

Forecasting

Introduction to Statistical Quality Control

Building and Using Decision Models

Decision Models With Uncertainty and Risk

Decisions, uncertainty, and Risk

Queues and Process Simulation Modeling

Linear Optimization

Integer, nonlinear, and Advanced Optimization Methods

Filters