Question 1

To construct the narrowest possible confidence intervals, use __________.________.

Accepted Answer

A)  small samples 
B)  large samples 
C)  the least efficient estimator 
D)  an unbiased statistic 
A)  small samples 
B)  large samples 
C)  the least efficient estimator 
D)  an unbiased statistic

Question 2

An alpha level of 0.05 is the same as a confidence level of________.

Accepted Answer

A)  99.5% 
B)  95% 
C)  90.5% 
D)  90% 
A)  99.5% 
B)  95% 
C)  90.5% 
D)  90%

Question 3

The sample standard deviation is a biased estimator of the population standard deviation. When using sample means as estimators, we correct for bias in the formula for finding confidence intervals by________.

Accepted Answer

A)  using N - 1 rather than N. 
B)  using N rather than N - 1. 
C)  using s rather than Z. 
D)  squaring the value of Z. 
A)  using N - 1 rather than N. 
B)  using N rather than N - 1. 
C)  using s rather than Z. 
D)  squaring the value of Z.

Question 4

A confidence level of 99% is the same as an alpha level of________.

Accepted Answer

A)  0.05 
B)  0.10 
C)  0.01 
D)  0.001 
A)  0.05 
B)  0.10 
C)  0.01 
D)  0.001

Question 5

In ________ of the cases, the mean of a sample selected by EPSEM will be more than±3 Z's from the population mean.

Accepted Answer

A)  less than 1% 
B)  more than 5% 
C)  more than 90% 
D)  more than 99% 
A)  less than 1% 
B)  more than 5% 
C)  more than 90% 
D)  more than 99%

Question 6

Calculate the confidence interval:________. Of the 1220 respondents for whom we have information, 178 said that they had been divorced at least once.

Accepted Answer

To calculate the confidence interval for

Question 7

Sample size and the width of confidence intervals________.

Accepted Answer

A)  increase at the same rate. 
B)  increase at different rates: sample size increases faster than interval width. 
C)  increase at different rates: sample size increases more slowly than interval width. 
D)  have no relationship to each other. 
A)  increase at the same rate. 
B)  increase at different rates: sample size increases faster than interval width. 
C)  increase at different rates: sample size increases more slowly than interval width. 
D)  have no relationship to each other.

Question 8

Which sample size will produce the confidence interval with the smallest width?

Accepted Answer

A)  100 
B)  200 
C)  500 
D)  1000 
A)  100 
B)  200 
C)  500 
D)  1000

Question 9

An estimator is unbiased if the mean of its sampling distribution is equal to________.

Accepted Answer

A)  the midpoint of the distribution. 
B)  the sample mean. 
C)  the population value. 
D)  the population median. 
A)  the midpoint of the distribution. 
B)  the sample mean. 
C)  the population value. 
D)  the population median.

Question 10

The sizes of four samples vary as follows: Sample A, N = 100 Sample B, N = 76Sample C, N =1000 Sample D, N = 150.
Which sample will produce the most efficient estimate?

Accepted Answer

A)  Sample A 
B)  Sample B 
C)  Sample C 
D)  Sample D 
A)  Sample A 
B)  Sample B 
C)  Sample C 
D)  Sample D

Question 11

In constructing interval estimates based on sample proportions (P s), the population proportion (P u) must be estimated. It is most conservative to estimate P uat________.

Accepted Answer

A)  P s 
B)  .50 
C)  .25 
D)  1.00 
A)  P s 
B)  .50 
C)  .25 
D)  1.00

Question 12

The width of an interval estimate can be controlled by________.

Accepted Answer

A)  changing the confidence level. 
B)  changing the alpha level. 
C)  changing the sample size. 
D)  Any of the answer choices 
A)  changing the confidence level. 
B)  changing the alpha level. 
C)  changing the sample size. 
D)  Any of the answer choices

Question 13

If you have a sample statistic and an unknown population standard deviation, you would use which formula to calculate the confidence interval.________.

Accepted Answer

A)    
B)    
C)    
D)  None of these choices are correct. 
A)    
B)    
C)    
D)  None of these choices are correct.

Question 14

We have used an alpha of 0.01 to estimate the average hours of television viewing for residents in a retirement home. What is the chance that our interval estimate does not contain the true population mean?________.

Accepted Answer

A)  99% 
B)  10% 
C)  1% 
D)  1/10 of 1% 
A)  99% 
B)  10% 
C)  1% 
D)  1/10 of 1%

Question 15

The probability that an interval estimate does not include the population value is called________.

Accepted Answer

A)  the margin. 
B)  alpha. 
C)  an error. 
D)  the odds. 
A)  the margin. 
B)  alpha. 
C)  an error. 
D)  the odds.

Question 16

A random sample of 500 reports an average yearly income of $42,000 with a standard deviation of $1000. An estimate of the parameter at the 95% level is about $175 wide. In this research situation________.

Accepted Answer

A)  we can be 95% confident that the population mean is 42,000 ± 175. 
B)  the sample size is much too small to justify the use of estimation procedures. 
C)  the alpha level is 1000. 
D)  the sample mean is $175. 
A)  we can be 95% confident that the population mean is 42,000 ± 175. 
B)  the sample size is much too small to justify the use of estimation procedures. 
C)  the alpha level is 1000. 
D)  the sample mean is $175.

Question 17

Sample proportions are________.

Accepted Answer

A)  biased. 
B)  theoretical. 
C)  unbiased. 
D)  None of these choices are correct. 
A)  biased. 
B)  theoretical. 
C)  unbiased. 
D)  None of these choices are correct.

To construct the narrowest possible confidence intervals, use __..

An alpha level of 0.05 is the same as a confidence level of________.

The sample standard deviation is a biased estimator of the population standard deviation. When using sample means as estimators, we correct for bias in the formula for finding confidence intervals by________.

A confidence level of 99% is the same as an alpha level of________.

In ________ of the cases, the mean of a sample selected by EPSEM will be more than±3 Z's from the population mean.

Calculate the confidence interval:________. Of the 1220 respondents for whom we have information, 178 said that they had been divorced at least once.

Sample size and the width of confidence intervals________.

Which sample size will produce the confidence interval with the smallest width?

An estimator is unbiased if the mean of its sampling distribution is equal to________.

The sizes of four samples vary as follows: Sample A, N = 100 Sample B, N = 76Sample C, N =1000 Sample D, N = 150. Which sample will produce the most efficient estimate?

In constructing interval estimates based on sample proportions (P s), the population proportion (P u) must be estimated. It is most conservative to estimate P uat________.

The width of an interval estimate can be controlled by________.

If you have a sample statistic and an unknown population standard deviation, you would use which formula to calculate the confidence interval.________.

We have used an alpha of 0.01 to estimate the average hours of television viewing for residents in a retirement home. What is the chance that our interval estimate does not contain the true population mean?________.

The probability that an interval estimate does not include the population value is called________.

A random sample of 500 reports an average yearly income of $42,000 with a standard deviation of $1000. An estimate of the parameter at the 95% level is about $175 wide. In this research situation________.

Sample proportions are________.

Introduction

Basic Descriptive Statistics Tables Percentages Rates and Ratios and Graphs

Measures of Central Tendency

Measures of Variation

The Normal Curve

Introduction to Inferential Statistics Sampling and the Sampling Distribution

Hypothesis Testing I the One Sample Case

Hypothesis Testing Ii the Two Sample Case

Hypothesis Testing Iii the Analysis of Variance

Hypothesis Testing Iv Chi Square

Bivariate Association for Nominal and Ordinal Level Variables

Association Between Variables Measured at the Interval Ratio Level

Elaborating Bivariate Tables

Partial Correlation and Multiple Regression and Correlation

Filters

Exam 7: Estimation Procedures

To construct the narrowest possible confidence intervals, use __________.________.

An alpha level of 0.05 is the same as a confidence level of________.

The sample standard deviation is a biased estimator of the population standard deviation. When using sample means as estimators, we correct for bias in the formula for finding confidence intervals by________.

A confidence level of 99% is the same as an alpha level of________.

In ________ of the cases, the mean of a sample selected by EPSEM will be more than±3 Z's from the population mean.

Calculate the confidence interval:________. Of the 1220 respondents for whom we have information, 178 said that they had been divorced at least once.

Sample size and the width of confidence intervals________.

Which sample size will produce the confidence interval with the smallest width?

An estimator is unbiased if the mean of its sampling distribution is equal to________.

The sizes of four samples vary as follows: Sample A, N = 100 Sample B, N = 76Sample C, N =1000 Sample D, N = 150. Which sample will produce the most efficient estimate?

In constructing interval estimates based on sample proportions (P s), the population proportion (P u) must be estimated. It is most conservative to estimate P uat________.

The width of an interval estimate can be controlled by________.

If you have a sample statistic and an unknown population standard deviation, you would use which formula to calculate the confidence interval.________.

We have used an alpha of 0.01 to estimate the average hours of television viewing for residents in a retirement home. What is the chance that our interval estimate does not contain the true population mean?________.

The probability that an interval estimate does not include the population value is called________.

A random sample of 500 reports an average yearly income of $42,000 with a standard deviation of $1000. An estimate of the parameter at the 95% level is about $175 wide. In this research situation________.

Sample proportions are________.

Introduction

Basic Descriptive Statistics Tables Percentages Rates and Ratios and Graphs

Measures of Central Tendency

Measures of Variation

The Normal Curve

Introduction to Inferential Statistics Sampling and the Sampling Distribution

Hypothesis Testing I the One Sample Case

Hypothesis Testing Ii the Two Sample Case

Hypothesis Testing Iii the Analysis of Variance

Hypothesis Testing Iv Chi Square

Bivariate Association for Nominal and Ordinal Level Variables

Association Between Variables Measured at the Interval Ratio Level

Elaborating Bivariate Tables

Partial Correlation and Multiple Regression and Correlation

Filters

To construct the narrowest possible confidence intervals, use __..