Question 1

When using sample means as estimators,we usually estimate the population standard deviation with

Accepted Answer

A) the sample standard deviation. 
B) the sampling distribution standard deviation. 
C) the population parameter. 
D) the Z score. 
A) the sample standard deviation. 
B) the sampling distribution standard deviation. 
C) the population parameter. 
D) the Z score.

Question 2

Based on an EPSEM sample of 300 state university students,we estimate that the average number of hours of study time each week is 30 $\pm$2.In this example,the population is

Accepted Answer

A) the 300 state university students. 
B) all state university students. 
C) unknown. 
D) the same as the parameter. 
A) the 300 state university students. 
B) all state university students. 
C) unknown. 
D) the same as the parameter.

Question 3

A random sample of 200 includes 100 Protestants.The researcher estimates at the 95% confidence level that between 43% and 57% of the population is Protestant.In this research situation

Accepted Answer

A) alpha is .10. 
B) Pu is 95. 
C) N is 100. 
D) Ps is .50. 
A) alpha is .10. 
B) Pu is 95. 
C) N is 100. 
D) Ps is .50.

Question 4

Both the sample and the population distributions are empirical,which means that they are

Accepted Answer

A) theoretical 
B) real 
C) ordinal 
D) stratified 
A) theoretical 
B) real 
C) ordinal 
D) stratified

Question 5

Polls tracking the popularity of President Bush show

Accepted Answer

A) dramatic increases in support following both the terrorist attacks of 9/11 and the invasion of Iraq. 
B) a dramatic increase in support following 9/11 but no particular change after the invasion of Iraq. 
C) a remarkable consistency in popularity that never exceeded 55% and never fell below 50%. 
D) low levels of support that have often fallen below 25% approval. 
A) dramatic increases in support following both the terrorist attacks of 9/11 and the invasion of Iraq. 
B) a dramatic increase in support following 9/11 but no particular change after the invasion of Iraq. 
C) a remarkable consistency in popularity that never exceeded 55% and never fell below 50%. 
D) low levels of support that have often fallen below 25% approval.

Question 6

All other things being equal,larger sample will cost more to process

Accepted Answer

A) but will not necessarily have narrower confidence intervals. 
B) and will always produce narrower confidence intervals. 
C) and will always produce wider confidence intervals. 
D) but will produce more precise intervals if the confidence level is low. 
A) but will not necessarily have narrower confidence intervals. 
B) and will always produce narrower confidence intervals. 
C) and will always produce wider confidence intervals. 
D) but will produce more precise intervals if the confidence level is low.

Question 7

The goal of estimation procedures is to infer ____ from ____.

Accepted Answer

A) intervals;estimates 
B) bias;efficiency 
C) statistics;parameters 
D) parameters;statistics 
A) intervals;estimates 
B) bias;efficiency 
C) statistics;parameters 
D) parameters;statistics

Question 8

The efficiency of any estimator can be improved by

Accepted Answer

A) increasing the sample size. 
B) decreasing the sample size. 
C) making the sample representative. 
D) changing the sample. 
A) increasing the sample size. 
B) decreasing the sample size. 
C) making the sample representative. 
D) changing the sample.

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

Question 10

To select a simple random sample,a researcher needs

Accepted Answer

A) a list of the population and system for selecting cases according to EPSEM. 
B) a list of the sample and a well developed sampling distribution. 
C) a sampling distribution and a table of random numbers. 
D) a parameter and a cluster. 
A) a list of the population and system for selecting cases according to EPSEM. 
B) a list of the sample and a well developed sampling distribution. 
C) a sampling distribution and a table of random numbers. 
D) a parameter and a cluster.

Question 11

To increase the probability that a confidence interval will include the population parameter,

Accepted Answer

A) lower the alpha level. 
B) raise the alpha level. 
C) increase the bias of the sample statistiC. 
D) set efficiency to zero. 
A) lower the alpha level. 
B) raise the alpha level. 
C) increase the bias of the sample statistiC. 
D) set efficiency to zero.

Question 12

Social scientists gather data from samples instead of populations because

Accepted Answer

A) samples are much larger and more complete. 
B) samples are more trustworthy. 
C) populations are often too large to test. 
D) samples are more meaningful and interesting. 
A) samples are much larger and more complete. 
B) samples are more trustworthy. 
C) populations are often too large to test. 
D) samples are more meaningful and interesting.

Question 13

A researcher wanted to learn something about the religious affiliation of the students at the local college (e.g. ,what percent were Catholic,Jewish,etc. ).This information was not available from the Registrar and the researcher was working with a very limited budget.Therefore,she used the principle of EPSEM to select a group of 200 students,called each of them at home,and conducted a brief interview.She was able to develop many conclusions based on this information.For example,she found that 50 of the 200 respondents were Catholic and concluded that about 25% of students at the college would claim the same religious affiliation.
Identify each of the following elements in this research scenario and explain their importance:
a.Population
b.Sample
c.Parameter 
d.Statistic
e.EPSEM
f.Representative

Accepted Answer

Population: The population in this resea

Question 14

A sample selected according to the principle of EPSEM is extremely likely to be

Accepted Answer

A) large. 
B) biased. 
C) representative. 
D) inaccurate. 
A) large. 
B) biased. 
C) representative. 
D) inaccurate.

Question 15

In your own words,explain the purpose of inferential statistics.Include in your essay the concepts of sample,population,statistic,parameter,representativeness,and the principle of EPSEM.Make sure that you define each of these terms as you develop your essay.

Accepted Answer

Inferential statistics is a branch of st

Question 16

We can estimate the probability that sample means and proportions lie within a given distance of the population value because these statistics are

Accepted Answer

A) unbiased. 
B) efficient. 
C) random. 
D) biaseD. 
A) unbiased. 
B) efficient. 
C) random. 
D) biaseD.

Question 17

Public opinion polls and election projections are examples of

Accepted Answer

A) estimation procedures. 
B) hypothesis testing. 
C) non-statistical research methods. 
D) blatant misuse of statistical procedures. 
A) estimation procedures. 
B) hypothesis testing. 
C) non-statistical research methods. 
D) blatant misuse of statistical procedures.

Question 18

I use the principle of EPSEM to select a sample from my church for an opinion poll.The sample

Accepted Answer

A) is guaranteed to be representative of the population. 
B) has a high probability of being representative. 
C) should never be larger than 100. 
D) should be larger than the population. 
A) is guaranteed to be representative of the population. 
B) has a high probability of being representative. 
C) should never be larger than 100. 
D) should be larger than the population.

Question 19

The efficiency of a sample estimator is essentially a matter of

Accepted Answer

A) accuracy 
B) validity 
C) centrality 
D) dispersion 
A) accuracy 
B) validity 
C) centrality 
D) dispersion

Question 20

The theorems presented in Chapter 7 tell us that if a sample is "large" the sampling distribution will be

Accepted Answer

A) the same shape as the population. 
B) normal. 
C) small. 
D) irrelevant. 
A) the same shape as the population. 
B) normal. 
C) small. 
D) irrelevant.

When using sample means as estimators,we usually estimate the population standard deviation with

Based on an EPSEM sample of 300 state university students,we estimate that the average number of hours of study time each week is 30 $\pm$ 2.In this example,the population is

A random sample of 200 includes 100 Protestants.The researcher estimates at the 95% confidence level that between 43% and 57% of the population is Protestant.In this research situation

Both the sample and the population distributions are empirical,which means that they are

Polls tracking the popularity of President Bush show

All other things being equal,larger sample will cost more to process

The goal of estimation procedures is to infer from .

The efficiency of any estimator can be improved by

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

To select a simple random sample,a researcher needs

To increase the probability that a confidence interval will include the population parameter,

Social scientists gather data from samples instead of populations because

A sample selected according to the principle of EPSEM is extremely likely to be

In your own words,explain the purpose of inferential statistics.Include in your essay the concepts of sample,population,statistic,parameter,representativeness,and the principle of EPSEM.Make sure that you define each of these terms as you develop your essay.

We can estimate the probability that sample means and proportions lie within a given distance of the population value because these statistics are

Public opinion polls and election projections are examples of

I use the principle of EPSEM to select a sample from my church for an opinion poll.The sample

The efficiency of a sample estimator is essentially a matter of

The theorems presented in Chapter 7 tell us that if a sample is "large" the sampling distribution will be

Introduction

Basic Descriptive Statistics: Percentages Ratios and Rates Frequency Distributions

Charts and Graphs

Measures of Central Tendency

Measures of Dispersion

The Normal Curve

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

Introduction to Bivariate Association and Measures of Association for Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and Multiple Regression and Correlation

Filters

Exam 7: Introduction in Inferential Statistics, the Sampling Distribution, and Estimation

When using sample means as estimators,we usually estimate the population standard deviation with

Based on an EPSEM sample of 300 state university students,we estimate that the average number of hours of study time each week is 30 ±\pm± 2.In this example,the population is

A random sample of 200 includes 100 Protestants.The researcher estimates at the 95% confidence level that between 43% and 57% of the population is Protestant.In this research situation

Both the sample and the population distributions are empirical,which means that they are

Polls tracking the popularity of President Bush show

All other things being equal,larger sample will cost more to process

The goal of estimation procedures is to infer ____ from ____.

The efficiency of any estimator can be improved by

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

To select a simple random sample,a researcher needs

To increase the probability that a confidence interval will include the population parameter,

Social scientists gather data from samples instead of populations because

A sample selected according to the principle of EPSEM is extremely likely to be

In your own words,explain the purpose of inferential statistics.Include in your essay the concepts of sample,population,statistic,parameter,representativeness,and the principle of EPSEM.Make sure that you define each of these terms as you develop your essay.

We can estimate the probability that sample means and proportions lie within a given distance of the population value because these statistics are

Public opinion polls and election projections are examples of

I use the principle of EPSEM to select a sample from my church for an opinion poll.The sample

The efficiency of a sample estimator is essentially a matter of

The theorems presented in Chapter 7 tell us that if a sample is "large" the sampling distribution will be

Introduction

Basic Descriptive Statistics: Percentages Ratios and Rates Frequency Distributions

Charts and Graphs

Measures of Central Tendency

Measures of Dispersion

The Normal Curve

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

Introduction to Bivariate Association and Measures of Association for Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and Multiple Regression and Correlation

Filters

Based on an EPSEM sample of 300 state university students,we estimate that the average number of hours of study time each week is 30 $\pm$ 2.In this example,the population is

The goal of estimation procedures is to infer from .