Question 1

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.

Question 2

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.

Question 3

Sample proportions are________.

Accepted Answer

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

Question 4

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.

Question 5

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

Question 6

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

Question 7

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

Accepted Answer

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

Question 8

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 9

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%

Question 10

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.

Question 11

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

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

Question 13

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%

Question 14

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.

Question 15

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%

Question 16

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

Question 17

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.

Exam 7: Estimation Procedures

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

Correct Answer
verified

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________.

Correct Answer
verified

The width of an interval estimate can be controlled by________.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Sample proportions are________.

Correct Answer
verified

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?________.

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
Answered by ExamLex AI
To calculate the confidence interval for...
View Answer

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________.

Correct Answer
verified

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

Correct Answer
verified

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________.

Correct Answer
verified

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

Correct Answer
verified

Sample size and the width of confidence intervals________.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Exam 7: Estimation Procedures

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

Correct AnswerverifiedShow Answer

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________.

Correct AnswerverifiedShow Answer

The width of an interval estimate can be controlled by________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Sample proportions are________.

Correct AnswerverifiedShow Answer

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?________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerAnswered by ExamLex AITo calculate the confidence interval for...View AnswerShow Answer

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________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Sample size and the width of confidence intervals________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
To calculate the confidence interval for...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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