Question 1

Given a mean of 2.1 and a standard deviation of 0.7, a 90% confidence interval will be 2.1   0.7.

Accepted Answer

A) True 
 B)False

Question 2

The lower limit of the 90% confidence interval for $\mu$, where n = 64,   = 70, and $\sigma$ = 20, is 65.89.

Accepted Answer

A) True 
 B)False

Question 3

Time Spent Playing Computer Games
Suppose that the amount of time teenagers spend playing computer games per week is normally distributed with a standard deviation of 1.5 hours.A sample of 100 teenagers is selected at random, and the sample mean computed as 6.5 hours.
-{Time Spent Playing Computer Games Narrative} Determine the 95% confidence interval estimate of the population mean if the population standard deviation is changed to 1.2.

Accepted Answer

LCL = 6.26

Question 4

The confidence ____________________ is the chance that the interval contains the parameter, over repeated sampling.

Accepted Answer

The answer of The confidence ____________________ is the chance that...

Question 5

College Dean
A college dean would like to estimate a population mean to within 40 units with 99% confidence given that the population standard deviation is 200.
-{College Dean Narrative} What sample size should be used?

Accepted Answer

n = 167 (u

Question 6

Define consistency.

Accepted Answer

An unbiased estimator is said

Question 7

An unbiased estimator of a population parameter is defined as:

Accepted Answer

A)  an estimator whose expected value is equal to the parameter. 
B)  an estimator whose variance is equal to one. 
C)  an estimator whose expected value is equal to zero. 
D)  an estimator whose variance goes to zero as the sample size goes to infinity. 
A)  an estimator whose expected value is equal to the parameter. 
B)  an estimator whose variance is equal to one. 
C)  an estimator whose expected value is equal to zero. 
D)  an estimator whose variance goes to zero as the sample size goes to infinity.

Question 8

An engineer for an electric fencing company is interested in the mean length of wires being cut automatically by machine.The desired length of the wires is 12 feet.It is known that the standard deviation in the cutting length is 0.15 feet.Suppose the engineer decided to estimate the mean length to within 0.025 with 99% confidence.What sample size would be needed?

Accepted Answer

n = 240 (u

Question 9

An electronics retailer is interested in studying the incomes of consumers in a particular area.The population standard deviation is known to be $1,000.What sample size would the researcher need to use for a 95% confidence interval if the difference between UCL and LCL should not be more than $100?

Accepted Answer

n = 1, 537 (Note tha

Question 10

The sample size needed to estimate a population mean to within 50 units was found to be 97.If the population standard deviation was 250, then the confidence level used was

Accepted Answer

A)  90% 
B)  95% 
C)  99% 
D)  None of these choices. 
A)  90% 
B)  95% 
C)  99% 
D)  None of these choices.

Question 11

To estimate the mean of a normal population whose standard deviation is 6, with a bound on the error of estimation equal to 1.2 and confidence level 99% requires a sample size of at least:

Accepted Answer

A)  166 
B)  167 
C)  13 
D)  None of these choices. 
A)  166 
B)  167 
C)  13 
D)  None of these choices.

Question 12

The larger the confidence level, the:

Accepted Answer

A)  smaller the value of z$\alpha$ / 2. 
B)  wider the confidence interval. 
C)  smaller the probability that the confidence interval will contain the population mean. 
D)  None of these choices. 
A)  smaller the value of z$\alpha$ / 2. 
B)  wider the confidence interval. 
C)  smaller the probability that the confidence interval will contain the population mean. 
D)  None of these choices.

Question 13

A confidence interval is defined as:

Accepted Answer

A)  a point estimate plus or minus a specific confidence level. 
B)  a lower and upper confidence limit associated with a specific level of confidence. 
C)  an interval that has a 95% probability of containing the population parameter. 
D)  a lower and upper confidence limit that has a 95% probability of containing the population parameter. 
A)  a point estimate plus or minus a specific confidence level. 
B)  a lower and upper confidence limit associated with a specific level of confidence. 
C)  an interval that has a 95% probability of containing the population parameter. 
D)  a lower and upper confidence limit that has a 95% probability of containing the population parameter.

Question 14

The term 1-$\alpha$0 refers to:

Accepted Answer

A)  the probability that a confidence interval does not contain the population parameter. 
B)  the confidence level. 
C)  the level of unbiasedness. 
D)  the level of consistency. 
A)  the probability that a confidence interval does not contain the population parameter. 
B)  the confidence level. 
C)  the level of unbiasedness. 
D)  the level of consistency.

Question 15

It is desired to estimate the average total compensation of CEOs in the publishing industry.Data were randomly collected from 18 CEOs and 95% confidence interval was calculated to be ($2,190,000, $4,720,000).Based on the interval above, do you believe the actual average total compensation of CEOs in the publishing industry could be $3,000,000?

Accepted Answer

A)  Yes, and I am sure of that. 
B)  Yes, and I am 95% confident of that. 
C)  No, and I am sure of that. 
D)  No, and I am 95% confident of that. 
A)  Yes, and I am sure of that. 
B)  Yes, and I am 95% confident of that. 
C)  No, and I am sure of that. 
D)  No, and I am 95% confident of that.

Question 16

A point estimate consists of a single sample statistic that is used to estimate the true population parameter.

Accepted Answer

A) True 
 B)False

Question 17

____________________ estimators do not have the capacity to reflect the effects of larger sample sizes.

Accepted Answer

The answer of ____________________ estimators do not have the capacity...

Question 18

Statisticians can control the ____________________ of a confidence interval by determining the sample size necessary to produce the desired results.

Accepted Answer

The answer of Statisticians can control the ____________________ of a...

Question 19

MN
-{Conference Rooms Rented Narrative} During January, a sample of 16 days has a sample mean of 48 rooms.This information is used to calculate an interval estimate for the population mean to be from 40 to 56 rooms.What is the level of confidence of this interval?

Accepted Answer

The answer of MN
-{Conference Rooms Rented Narrative} During January, a...

Question 20

An unbiased estimator has an average value (across all samples) equal to the population parameter.

Accepted Answer

A) True 
 B)False

Given a mean of 2.1 and a standard deviation of 0.7, a 90% confidence interval will be 2.1 0.7.

The lower limit of the 90% confidence interval for $\mu$ , where n = 64, $The lower limit of the 90% confidence interval for \mu , where n = 64, = 70, and \sigma = 20, is 65.89.$ = 70, and $\sigma$ = 20, is 65.89.

The confidence ____________________ is the chance that the interval contains the parameter, over repeated sampling.

College Dean A college dean would like to estimate a population mean to within 40 units with 99% confidence given that the population standard deviation is 200. -{College Dean Narrative} What sample size should be used?

Define consistency.

An unbiased estimator of a population parameter is defined as:

An electronics retailer is interested in studying the incomes of consumers in a particular area.The population standard deviation is known to be $1,000.What sample size would the researcher need to use for a 95% confidence interval if the difference between UCL and LCL should not be more than $100?

The sample size needed to estimate a population mean to within 50 units was found to be 97.If the population standard deviation was 250, then the confidence level used was

To estimate the mean of a normal population whose standard deviation is 6, with a bound on the error of estimation equal to 1.2 and confidence level 99% requires a sample size of at least:

The larger the confidence level, the:

A confidence interval is defined as:

The term 1- $\alpha$ 0 refers to:

A point estimate consists of a single sample statistic that is used to estimate the true population parameter.

____________________ estimators do not have the capacity to reflect the effects of larger sample sizes.

Statisticians can control the ____________________ of a confidence interval by determining the sample size necessary to produce the desired results.

MN -{Conference Rooms Rented Narrative} During January, a sample of 16 days has a sample mean of 48 rooms.This information is used to calculate an interval estimate for the population mean to be from 40 to 56 rooms.What is the level of confidence of this interval?

An unbiased estimator has an average value (across all samples) equal to the population parameter.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

Numerical Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Filters

Exam 10: Introduction to Estimation

Given a mean of 2.1 and a standard deviation of 0.7, a 90% confidence interval will be 2.1 0.7.

The lower limit of the 90% confidence interval for μ\muμ , where n = 64, = 70, and σ\sigmaσ = 20, is 65.89.

The confidence ____________________ is the chance that the interval contains the parameter, over repeated sampling.

College Dean A college dean would like to estimate a population mean to within 40 units with 99% confidence given that the population standard deviation is 200. -{College Dean Narrative} What sample size should be used?

Define consistency.

An unbiased estimator of a population parameter is defined as:

An electronics retailer is interested in studying the incomes of consumers in a particular area.The population standard deviation is known to be $1,000.What sample size would the researcher need to use for a 95% confidence interval if the difference between UCL and LCL should not be more than $100?

The sample size needed to estimate a population mean to within 50 units was found to be 97.If the population standard deviation was 250, then the confidence level used was

To estimate the mean of a normal population whose standard deviation is 6, with a bound on the error of estimation equal to 1.2 and confidence level 99% requires a sample size of at least:

The larger the confidence level, the:

A confidence interval is defined as:

The term 1- α\alphaα 0 refers to:

A point estimate consists of a single sample statistic that is used to estimate the true population parameter.

____________________ estimators do not have the capacity to reflect the effects of larger sample sizes.

Statisticians can control the ____________________ of a confidence interval by determining the sample size necessary to produce the desired results.

MN -{Conference Rooms Rented Narrative} During January, a sample of 16 days has a sample mean of 48 rooms.This information is used to calculate an interval estimate for the population mean to be from 40 to 56 rooms.What is the level of confidence of this interval?

An unbiased estimator has an average value (across all samples) equal to the population parameter.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

Numerical Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Filters

The lower limit of the 90% confidence interval for $\mu$ , where n = 64, $The lower limit of the 90% confidence interval for \mu , where n = 64, = 70, and \sigma = 20, is 65.89.$ = 70, and $\sigma$ = 20, is 65.89.

The term 1- $\alpha$ 0 refers to: