Question 1

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 2

The sample size needed to estimate the population mean was found to be 865. If the value of the population standard deviation was 75, and the maximum allowable error was 5, then the confidence level used was 95%.

Accepted Answer

A) True 
 B)False

Question 3

The sample variance s2 is an unbiased estimator of the population variance $\sigma$2 when the denominator of s2 is

Accepted Answer

A) n + 1 
B) n 
C) n -1 
D)  $\sqrt { n - 1 }$ 
A) n + 1 
B) n 
C) n -1 
D)  $\sqrt { n - 1 }$

Question 4

When determining the required sample size for a confidence interval, you need to know the population ____________________, the confidence ____________________, and the ____________________ on the error of estimation.

Accepted Answer

standard d

Question 5

As the bound on the error of estimation decreases, the sample size ____________________.

Accepted Answer

The answer of As the bound on the error of...

Question 6

A 95% confidence interval estimate for a population mean $\mu$ is determined to be 75 to 85. If the confidence level is reduced to 80%, the confidence interval for $\mu$  becomes wider.

Accepted Answer

A) True 
 B)False

Question 7

An economist is interested in studying the spending habits of consumers in a particular region. The population standard deviation is known to be $1,000. A random sample of 50 individuals resulted in an average expense of $15,000. What is the width of the 99% confidence interval?

Accepted Answer

The answer of An economist is interested in studying the...

Question 8

The temperature readings for 20 fall days (degrees Fahrenheit) in Wheeling, West Virginia, are normally distributed with a mean of 5.5 degrees and a standard deviation of 1.5 degrees. Determine the 90% confidence interval estimate for the fall mean temperature.

Accepted Answer

LCL = 4.9

Question 9

A random sample of 10 university students was surveyed to help estimate the average amount of time students spent per week on their computers. The student hours spent using a personal computer over a randomly selected week were 13, 14, 5, 6, 8, 10, 7, 12, 15, 3.
a.Find an unbiased estimator of the average time per week for all university students.
b.Find an unbiased estimator of the variance.
c.Find a consistent estimator of the average time per week for all university students.

Accepted Answer

a.An unbiased estimator of the populatio

Question 10

In the formula for a confidence interval for $\mu$, 1 - $\alpha$ is called the ____________________.

Accepted Answer

The answer of In the formula for a confidence interval...

Question 11

A confidence interval is an interval estimate for which there is a specified degree of certainty that the actual value of the population parameter will fall within the interval.

Accepted Answer

A) True 
 B)False

Question 12

Increasing the value of 1 -$\alpha$narrows a confidence interval.

Accepted Answer

A) True 
 B)False

Question 13

If the population values are very close to each other, the width of the confidence interval is ____________________ than if the population values are very far apart.

Accepted Answer

The answer of If the population values are very close...

Question 14

When determining the sample size necessary for estimating the true population mean, which factor is not of our concern when sampling with replacement?

Accepted Answer

A) The allowable or tolerable sampling error. 
B) The level of confidence desired in the estimate. 
C) The population standard deviation. 
D) The population size. 
A) The allowable or tolerable sampling error. 
B) The level of confidence desired in the estimate. 
C) The population standard deviation. 
D) The population size.

Question 15

The sample ____________________ is relatively more efficient than the sample ____________________ when estimating the population mean.

Accepted Answer

mean; medi

Question 16

A specific confidence interval obtained from data will always correctly estimate the population parameter.

Accepted Answer

A) True 
 B)False

Question 17

A financial consultant wanted to determine the mean annual return on Bond funds. A random sample of 60 returns shows a mean of 12%. If the population standard deviation is assumed to be 4%, estimate with 95% confidence the mean annual return on all Bond funds.

Accepted Answer

LCL = 11%

Question 18

The bound on the error of estimation is the ____________________ amount of sampling error that we are willing to tolerate.

Accepted Answer

maximum
gr

Question 19

The population mean is a(n) ____________________ but ____________________ quantity.

Accepted Answer

fixed; unk

Question 20

A(n) ____________________ estimator of a population parameter is an estimator whose expected value is equal to that parameter.

Accepted Answer

The answer of A(n) ____________________ estimator of a population parameter...

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

The sample size needed to estimate the population mean was found to be 865. If the value of the population standard deviation was 75, and the maximum allowable error was 5, then the confidence level used was 95%.

The sample variance s² is an unbiased estimator of the population variance $\sigma$ ² when the denominator of s² is

When determining the required sample size for a confidence interval, you need to know the population , the confidence , and the on the error of estimation.

As the bound on the error of estimation decreases, the sample size ____________________.

A 95% confidence interval estimate for a population mean $\mu$ is determined to be 75 to 85. If the confidence level is reduced to 80%, the confidence interval for $\mu$ becomes wider.

An economist is interested in studying the spending habits of consumers in a particular region. The population standard deviation is known to be $1,000. A random sample of 50 individuals resulted in an average expense of $15,000. What is the width of the 99% confidence interval?

The temperature readings for 20 fall days (degrees Fahrenheit) in Wheeling, West Virginia, are normally distributed with a mean of 5.5 degrees and a standard deviation of 1.5 degrees. Determine the 90% confidence interval estimate for the fall mean temperature.

In the formula for a confidence interval for $\mu$ , 1 - $\alpha$ is called the ____________________.

A confidence interval is an interval estimate for which there is a specified degree of certainty that the actual value of the population parameter will fall within the interval.

Increasing the value of 1 - $\alpha$ narrows a confidence interval.

If the population values are very close to each other, the width of the confidence interval is ____________________ than if the population values are very far apart.

When determining the sample size necessary for estimating the true population mean, which factor is not of our concern when sampling with replacement?

The sample is relatively more efficient than the sample when estimating the population mean.

A specific confidence interval obtained from data will always correctly estimate the population parameter.

A financial consultant wanted to determine the mean annual return on Bond funds. A random sample of 60 returns shows a mean of 12%. If the population standard deviation is assumed to be 4%, estimate with 95% confidence the mean annual return on all Bond funds.

The bound on the error of estimation is the ____________________ amount of sampling error that we are willing to tolerate.

The population mean is a(n) but quantity.

A(n) ____________________ estimator of a population parameter is an estimator whose expected value is equal to that 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 Optional

Simple Linear Regression and Correlation

Multiple Regression

Filters

Exam 10: Introduction to Estimation

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

The sample size needed to estimate the population mean was found to be 865. If the value of the population standard deviation was 75, and the maximum allowable error was 5, then the confidence level used was 95%.

The sample variance s2 is an unbiased estimator of the population variance σ\sigmaσ 2 when the denominator of s2 is

When determining the required sample size for a confidence interval, you need to know the population ____________________, the confidence ____________________, and the ____________________ on the error of estimation.

As the bound on the error of estimation decreases, the sample size ____________________.

A 95% confidence interval estimate for a population mean μ\muμ is determined to be 75 to 85. If the confidence level is reduced to 80%, the confidence interval for μ\muμ becomes wider.

An economist is interested in studying the spending habits of consumers in a particular region. The population standard deviation is known to be $1,000. A random sample of 50 individuals resulted in an average expense of $15,000. What is the width of the 99% confidence interval?

The temperature readings for 20 fall days (degrees Fahrenheit) in Wheeling, West Virginia, are normally distributed with a mean of 5.5 degrees and a standard deviation of 1.5 degrees. Determine the 90% confidence interval estimate for the fall mean temperature.

In the formula for a confidence interval for μ\muμ , 1 - α\alphaα is called the ____________________.

A confidence interval is an interval estimate for which there is a specified degree of certainty that the actual value of the population parameter will fall within the interval.

Increasing the value of 1 - α\alphaα narrows a confidence interval.

If the population values are very close to each other, the width of the confidence interval is ____________________ than if the population values are very far apart.

When determining the sample size necessary for estimating the true population mean, which factor is not of our concern when sampling with replacement?

The sample ____________________ is relatively more efficient than the sample ____________________ when estimating the population mean.

A specific confidence interval obtained from data will always correctly estimate the population parameter.

A financial consultant wanted to determine the mean annual return on Bond funds. A random sample of 60 returns shows a mean of 12%. If the population standard deviation is assumed to be 4%, estimate with 95% confidence the mean annual return on all Bond funds.

The bound on the error of estimation is the ____________________ amount of sampling error that we are willing to tolerate.

The population mean is a(n) ____________________ but ____________________ quantity.

A(n) ____________________ estimator of a population parameter is an estimator whose expected value is equal to that 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 Optional

Simple Linear Regression and Correlation

Multiple Regression

Filters

The sample variance s² is an unbiased estimator of the population variance $\sigma$ ² when the denominator of s² is

When determining the required sample size for a confidence interval, you need to know the population , the confidence , and the on the error of estimation.

A 95% confidence interval estimate for a population mean $\mu$ is determined to be 75 to 85. If the confidence level is reduced to 80%, the confidence interval for $\mu$ becomes wider.

In the formula for a confidence interval for $\mu$ , 1 - $\alpha$ is called the ____________________.

Increasing the value of 1 - $\alpha$ narrows a confidence interval.

The sample is relatively more efficient than the sample when estimating the population mean.

The population mean is a(n) but quantity.