Question 1

The upper limit of the 90% confidence interval for the population proportion p,given that n = 100; and   = 0.20 is 0.2658.

Accepted Answer

A) True 
 B)False

Question 2

The lower limit of the 95% confidence interval for the population proportion p,given that n = 300; and   = 0.10 is 0.1339.

Accepted Answer

A) True 
 B)False

Question 3

The chi-square and F-distributions are used primarily to make inferences about population ____.

Accepted Answer

A) means 
B) variances 
C) medians 
D) proportions 
A) means 
B) variances 
C) medians 
D) proportions

Question 4

If a sample has 20 observations and a 95% confidence estimate for   is needed,the appropriate value of t-multiple is 2.093

Accepted Answer

A) True 
 B)False

Question 5

The value of the standard error of the difference between sample proportions depends on the sample proportion from each of the two populations as well as the sample size selected from each population.

Accepted Answer

A) True 
 B)False

Question 6

As the sample size increases,the t-distribution becomes more similar to the _____ distribution.

Accepted Answer

A) normal 
B) exponential 
C) binomial 
D) chi-square 
A) normal 
B) exponential 
C) binomial 
D) chi-square

Question 7

The mean of the sampling distribution of the sample proportion   ,when the sample size n = 100 and the population proportion p = 0.15,is 15.0.

Accepted Answer

A) True 
 B)False

Question 8

You are told that a random sample of 150 people from Iowa has been given cholesterol tests,and 60 of these people had levels over the "safe" count of 200.Construct a 95% confidence interval for the population proportion of people in Iowa with cholesterol levels over 200.

Accepted Answer

@#IMG-DLM& @#IMG-DLM& = (0.321

Question 9

The t-distribution and the standard normal distribution are practically indistinguishable as the degrees of freedom increase.

Accepted Answer

A) True 
 B)False

Question 10

After calculating the sample size needed to estimate a population proportion to within 0.05,you have been told that the maximum allowable error (B)must be reduced to just 0.025.If the original calculation led to a sample size of 1000,the sample size will now have to be

Accepted Answer

A) 2000. 
B) 4000. 
C) 1000. 
D) 8000. 
A) 2000. 
B) 4000. 
C) 1000. 
D) 8000.

Question 11

The necessary sample size can only be determined for estimation problems regarding proportions because we do not know the value of the population standard deviation needed to calculate the necessary sample size for problems dealing with a population mean(s).

Accepted Answer

A) True 
 B)False

Question 12

Samples of exam scores for employees before and after a training class are examples of paired data.

Accepted Answer

A) True 
 B)False

Question 13

The 95% confidence interval for the population mean   ,given that the sample size n = 49 and the population standard deviation   = 7,is   .

Accepted Answer

A) True 
 B)False

Question 14

The general form of a confidence interval is

Accepted Answer

A) Point Estimate ± Multiple × Standard Error. 
B) Point Estimate ± Multiple + Standard Error. 
C) Point Estimate ± Multiple - Standard Error. 
D) Point Estimate ± Multiple ± Standard Error. 
A) Point Estimate ± Multiple × Standard Error. 
B) Point Estimate ± Multiple + Standard Error. 
C) Point Estimate ± Multiple - Standard Error. 
D) Point Estimate ± Multiple ± Standard Error.

Question 15

When samples of size n are drawn from a population,then the sampling distribution of the sample mean   is approximately normal,provided that n is reasonably large.

Accepted Answer

A) True 
 B)False

Question 16

Suppose that we want to estimate the difference in the proportion of all men and women that favor a homeless shelter opening up in their community.We should use a confidence interval for a difference between two population means to create our estimate.

Accepted Answer

A) True 
 B)False

Question 17

We can form a confidence interval for the population total T by finding a confidence interval for the population mean   in the usual way,and then multiplying the lower and upper limits the confidence interval by the population size N.

Accepted Answer

A) True 
 B)False

Question 18

From a sample of 500 items,30 were found to be defective.The point estimate of the population proportion defective will be

Accepted Answer

A) 0.06. 
B) 30.0. 
C) 470. 
D) 0.94. 
A) 0.06. 
B) 30.0. 
C) 470. 
D) 0.94.

Question 19

What is an example of a problem in which the sample data is likely to be paired?

Accepted Answer

A) The difference between the means of appraised and sales house prices 
B) The difference between the proportion of defective items from two suppliers 
C) The difference in the mean life of two major brands of batteries 
D) The difference in the mean salaries for graduates in two different academic fields at a university 
A) The difference between the means of appraised and sales house prices 
B) The difference between the proportion of defective items from two suppliers 
C) The difference in the mean life of two major brands of batteries 
D) The difference in the mean salaries for graduates in two different academic fields at a university

Question 20

The number of degrees of freedom needed to construct 90% confidence interval for the difference between means when the data are gathered from paired samples,with 15 observations in each sample,is

Accepted Answer

A) 30. 
B) 15. 
C) 28. 
D) 14. 
A) 30. 
B) 15. 
C) 28. 
D) 14.

The upper limit of the 90% confidence interval for the population proportion p,given that n = 100; and = 0.20 is 0.2658.

The lower limit of the 95% confidence interval for the population proportion p,given that n = 300; and = 0.10 is 0.1339.

The chi-square and F-distributions are used primarily to make inferences about population ____.

If a sample has 20 observations and a 95% confidence estimate for is needed,the appropriate value of t-multiple is 2.093

The value of the standard error of the difference between sample proportions depends on the sample proportion from each of the two populations as well as the sample size selected from each population.

As the sample size increases,the t-distribution becomes more similar to the _____ distribution.

The mean of the sampling distribution of the sample proportion ,when the sample size n = 100 and the population proportion p = 0.15,is 15.0.

You are told that a random sample of 150 people from Iowa has been given cholesterol tests,and 60 of these people had levels over the "safe" count of 200.Construct a 95% confidence interval for the population proportion of people in Iowa with cholesterol levels over 200.

The t-distribution and the standard normal distribution are practically indistinguishable as the degrees of freedom increase.

After calculating the sample size needed to estimate a population proportion to within 0.05,you have been told that the maximum allowable error (B)must be reduced to just 0.025.If the original calculation led to a sample size of 1000,the sample size will now have to be

The necessary sample size can only be determined for estimation problems regarding proportions because we do not know the value of the population standard deviation needed to calculate the necessary sample size for problems dealing with a population mean(s).

Samples of exam scores for employees before and after a training class are examples of paired data.

The 95% confidence interval for the population mean ,given that the sample size n = 49 and the population standard deviation = 7,is .

The general form of a confidence interval is

When samples of size n are drawn from a population,then the sampling distribution of the sample mean is approximately normal,provided that n is reasonably large.

Suppose that we want to estimate the difference in the proportion of all men and women that favor a homeless shelter opening up in their community.We should use a confidence interval for a difference between two population means to create our estimate.

We can form a confidence interval for the population total T by finding a confidence interval for the population mean in the usual way,and then multiplying the lower and upper limits the confidence interval by the population size N.

From a sample of 500 items,30 were found to be defective.The point estimate of the population proportion defective will be

What is an example of a problem in which the sample data is likely to be paired?

The number of degrees of freedom needed to construct 90% confidence interval for the difference between means when the data are gathered from paired samples,with 15 observations in each sample,is

Introduction to Business Analytics

Describing the Distribution of a Variable

Finding Relationships Among Variables

Business Intelligence Bifor Data Analysis

Probability and Probability Distributions

Decision Making Under Uncertainty

Sampling and Sampling Distributions

Hypothesis Testing

Regression Analysis: Estimating Relationships

Regression Analysis: Statistical Inference

Time Series Analysis and Forecasting

Introduction to Optimization Modeling

Optimization Models

Introduction to Simulation Modeling

Simulation Models

Data Mining

Analysis of Variance and Experimental Design

Statistical Process Control

Filters

Exam 8: Confidence Interval Estimation

The upper limit of the 90% confidence interval for the population proportion p,given that n = 100; and = 0.20 is 0.2658.

The lower limit of the 95% confidence interval for the population proportion p,given that n = 300; and = 0.10 is 0.1339.

The chi-square and F-distributions are used primarily to make inferences about population ____.

If a sample has 20 observations and a 95% confidence estimate for is needed,the appropriate value of t-multiple is 2.093

The value of the standard error of the difference between sample proportions depends on the sample proportion from each of the two populations as well as the sample size selected from each population.

As the sample size increases,the t-distribution becomes more similar to the _____ distribution.

The mean of the sampling distribution of the sample proportion ,when the sample size n = 100 and the population proportion p = 0.15,is 15.0.

You are told that a random sample of 150 people from Iowa has been given cholesterol tests,and 60 of these people had levels over the "safe" count of 200.Construct a 95% confidence interval for the population proportion of people in Iowa with cholesterol levels over 200.

The t-distribution and the standard normal distribution are practically indistinguishable as the degrees of freedom increase.

After calculating the sample size needed to estimate a population proportion to within 0.05,you have been told that the maximum allowable error (B)must be reduced to just 0.025.If the original calculation led to a sample size of 1000,the sample size will now have to be

The necessary sample size can only be determined for estimation problems regarding proportions because we do not know the value of the population standard deviation needed to calculate the necessary sample size for problems dealing with a population mean(s).

Samples of exam scores for employees before and after a training class are examples of paired data.

The 95% confidence interval for the population mean ,given that the sample size n = 49 and the population standard deviation = 7,is .

The general form of a confidence interval is

When samples of size n are drawn from a population,then the sampling distribution of the sample mean is approximately normal,provided that n is reasonably large.

Suppose that we want to estimate the difference in the proportion of all men and women that favor a homeless shelter opening up in their community.We should use a confidence interval for a difference between two population means to create our estimate.

We can form a confidence interval for the population total T by finding a confidence interval for the population mean in the usual way,and then multiplying the lower and upper limits the confidence interval by the population size N.

From a sample of 500 items,30 were found to be defective.The point estimate of the population proportion defective will be

What is an example of a problem in which the sample data is likely to be paired?

The number of degrees of freedom needed to construct 90% confidence interval for the difference between means when the data are gathered from paired samples,with 15 observations in each sample,is

Introduction to Business Analytics

Describing the Distribution of a Variable

Finding Relationships Among Variables

Business Intelligence Bifor Data Analysis

Probability and Probability Distributions

Decision Making Under Uncertainty

Sampling and Sampling Distributions

Hypothesis Testing

Regression Analysis: Estimating Relationships

Regression Analysis: Statistical Inference

Time Series Analysis and Forecasting

Introduction to Optimization Modeling

Optimization Models

Introduction to Simulation Modeling

Simulation Models

Data Mining

Analysis of Variance and Experimental Design

Statistical Process Control

Filters