Question 1

The smaller the level of confidence used in constructing a confidence interval estimate of the population mean, the:

Accepted Answer

A) more likely that the confidence interval will contain the population mean. 
B) wider the confidence interval. 
C) narrower the confidence interval. 
D) larger the sample required to estimate the population mean to within a certain error bound. 
A) more likely that the confidence interval will contain the population mean. 
B) wider the confidence interval. 
C) narrower the confidence interval. 
D) larger the sample required to estimate the population mean to within a certain error bound.

Question 2

Which of the following statistical distributions is used when estimating the population mean when the population variance is known?

Accepted Answer

A) Student t distribution 
B) Standard normal distribution 
C) Chi-square distribution 
D) None of these choices are correct. 
A) Student t distribution 
B) Standard normal distribution 
C) Chi-square distribution 
D) None of these choices are correct.

Question 3

The degrees of freedom used to find the t/2 for a confidence interval for the population mean?

Accepted Answer

A) The degrees of freedom are n − 2. 
B) The degrees of freedom are n − 3. 
C) The degrees of freedom are n − 1. 
D) The degrees of freedom are n. 
A) The degrees of freedom are n − 2. 
B) The degrees of freedom are n − 3. 
C) The degrees of freedom are n − 1. 
D) The degrees of freedom are n.

Question 4

A sample of size 300 is to be taken at random from an infinite population. Given that the population proportion is 0.70, the probability that the sample proportion will be smaller than 0.75 is:

Accepted Answer

A) 0.9706. 
B) 0.4772. 
C) 0.4706. 
D) 0.9772. 
A) 0.9706. 
B) 0.4772. 
C) 0.4706. 
D) 0.9772.

Question 5

Which of the following best describes an unbiased estimator?

Accepted Answer

A) Every estimator is an unbiased estimator. 
B) An interval estimator is an unbiased estimator. 
C) An unbiased estimator of a population parameter is an estimator whose expected value is equal to that parameter. 
D) None of these choices are correct. 
A) Every estimator is an unbiased estimator. 
B) An interval estimator is an unbiased estimator. 
C) An unbiased estimator of a population parameter is an estimator whose expected value is equal to that parameter. 
D) None of these choices are correct.

The smaller the level of confidence used in constructing a confidence interval estimate of the population mean, the:

Which of the following statistical distributions is used when estimating the population mean when the population variance is known?

The degrees of freedom used to find the t/2 for a confidence interval for the population mean?

A sample of size 300 is to be taken at random from an infinite population. Given that the population proportion is 0.70, the probability that the sample proportion will be smaller than 0.75 is:

Which of the following best describes an unbiased estimator?

What Is Statistics

Types of Data, Data Collection and Sampling

Graphical Descriptive Techniques Nominal Data

Graphical Descriptive Techniques Numerical Data

Numerical Descriptive Measures

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Statistical Inference and Sampling Distributions

Estimation: Comparing Two Populations

Hypothesis Testing: Describing a Single Population

Hypothesis Testing: Comparing Two Populations

Additional Tests for Nominal Data: Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Time-Series Analysis and Forecasting

Index Numbers

Filters

Exam 10: Estimation: Describing a Single Population

The smaller the level of confidence used in constructing a confidence interval estimate of the population mean, the:

Which of the following statistical distributions is used when estimating the population mean when the population variance is known?

The degrees of freedom used to find the t/2 for a confidence interval for the population mean?

A sample of size 300 is to be taken at random from an infinite population. Given that the population proportion is 0.70, the probability that the sample proportion will be smaller than 0.75 is:

Which of the following best describes an unbiased estimator?

What Is Statistics

Types of Data, Data Collection and Sampling

Graphical Descriptive Techniques Nominal Data

Graphical Descriptive Techniques Numerical Data

Numerical Descriptive Measures

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Statistical Inference and Sampling Distributions

Estimation: Comparing Two Populations

Hypothesis Testing: Describing a Single Population

Hypothesis Testing: Comparing Two Populations

Additional Tests for Nominal Data: Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Time-Series Analysis and Forecasting

Index Numbers

Filters