Question 1

What are confidence intervals, confidence levels, and margins of error?

Accepted Answer

A confidence interval is a range of valu

Question 2

Which of the following statements is correct?

Accepted Answer

A)  As the standard error decreases, the margin of error increases. 
B)  Where the center of a sampling distribution occurs on the number line depends on the size of the samples being taken. 
C)  Both "a" and "b" are correct. 
D)  None of the above is correct. 
A)  As the standard error decreases, the margin of error increases. 
B)  Where the center of a sampling distribution occurs on the number line depends on the size of the samples being taken. 
C)  Both "a" and "b" are correct. 
D)  None of the above is correct.

Question 3

A researcher measured the pulse of a random sample of students finishing the SAT exam. The results of the study were sample size = 25, sample mean = 80, and sample standard deviation = 20. What is the best estimate for the standard error of the sampling distribution?

Accepted Answer

A)  3.2 
B)  4 
C)  5 
D)  16 
A)  3.2 
B)  4 
C)  5 
D)  16

Question 4

Which of the following statements is correct?

Accepted Answer

A)  As the standard error decreases, the margin of error decreases. 
B)  The larger the margin of error, the wider the confidence interval will be. 
C)  Both "a" and "b" are correct. 
D)  None of the above is correct. 
A)  As the standard error decreases, the margin of error decreases. 
B)  The larger the margin of error, the wider the confidence interval will be. 
C)  Both "a" and "b" are correct. 
D)  None of the above is correct.

Question 5

One-thousand professors each estimate the average number of books read last year by students by asking 500 randomly-selected students. The distribution of results from the 1,000 samples has a mean of 10 books and a standard error of 1 book. Of the 1000 professors, what percent will probably get an estimate
A) Above 12 books? __________
B) Between 10 and 12 books? __________
C) Below 10 books? __________
D) Is this problem about a frequency distribution or a sampling distribution? (frequency / sampling)

Accepted Answer

a. 2.5%
b.

Question 6

A researcher takes a random sample from a population. What is the percent chance the sample result will be within two standard errors of the true value in the population?

Accepted Answer

A)  68% 
B)  95% 
C)  99.7% 
D)  100% 
A)  68% 
B)  95% 
C)  99.7% 
D)  100%

Question 7

Which sampling distribution will typically have the smallest standard error?

Accepted Answer

A)  a sampling distribution based on cluster random sampling 
B)  a sampling distribution based on simple random sampling 
C)  a sampling distribution based on stratified random sampling 
D)  a sampling distribution based on systematic random sampling 
A)  a sampling distribution based on cluster random sampling 
B)  a sampling distribution based on simple random sampling 
C)  a sampling distribution based on stratified random sampling 
D)  a sampling distribution based on systematic random sampling

Question 8

If a researcher wants to make a statement with a 95% level of confidence, the margin of error is the standard error multiplied by

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  5 
A)  1 
B)  2 
C)  3 
D)  5

Question 9

What is the difference between a frequency distribution and a sampling distribution?

Accepted Answer

A frequency distribution shows

Question 10

Why do researchers prefer sampling distributions with small standard errors?

Accepted Answer

Samples from sampling distributions with

Question 11

One thousand researchers each take random samples of 1,000 Americans and ask their age. The sampling distribution has a standard error of 0.5 years. If the true average age of the population is 38, what percent of the researchers will get an average sample age between 36.5 and 39.5 years?

Accepted Answer

A)  38% 
B)  68% 
C)  95% 
D)  99.7% 
A)  38% 
B)  68% 
C)  95% 
D)  99.7%

Question 12

What kinds of questions can you answer using the properties of sampling distributions and normal distributions?

Accepted Answer

If a variable is normally distributed wi

Question 13

A sampling distribution has a mean of 100 and a standard error of 2. What percent of samples will get sample results between 98 and 102?

Accepted Answer

A)  2% 
B)  4% 
C)  68% 
D)  95% 
A)  2% 
B)  4% 
C)  68% 
D)  95%

Question 14

One-thousand researchers each estimate the average number of CDs owned by students by asking 500 randomly-selected students. The distribution of results from the 1,000 samples has a mean of 100 CDs and a standard error of 3 CDs. Of the 1000 professors, what percent will probably get an estimate
A) Below 94 CDs? __________
B) Between 94 and 106 CDs? __________
C) Above 103 CDs? __________
D) Is this problem about a frequency distribution or a sampling distribution? (frequency / sampling)
E) What is the mode for this distribution? __________

Accepted Answer

a. 2.5%
b.

Question 15

A _____ shows how frequently particular statistical results would occur if every possible sample of a particular size from a particular population were taken.

Accepted Answer

A)  census distribution 
B)  frequency distribution 
C)  Poisson distribution 
D)  sampling distribution 
A)  census distribution 
B)  frequency distribution 
C)  Poisson distribution 
D)  sampling distribution

Question 16

A measure of dispersion for a sampling distribution is the

Accepted Answer

A)  sampling frame 
B)  standard deviation 
C)  standard error 
D)  sampling interval 
A)  sampling frame 
B)  standard deviation 
C)  standard error 
D)  sampling interval

Question 17

Which of the following sampling procedures will support inferential statistics?

Accepted Answer

A)  convenience sampling 
B)  purposive sampling 
C)  quota sampling 
D)  simple random sampling 
A)  convenience sampling 
B)  purposive sampling 
C)  quota sampling 
D)  simple random sampling

Question 18

The difference between a sample result and a census result is the

Accepted Answer

A)  confidence line 
B)  margin of error 
C)  methodological artifact 
D)  sampling error 
A)  confidence line 
B)  margin of error 
C)  methodological artifact 
D)  sampling error

Question 19

Which sampling distribution will typically have the smallest standard error?

Accepted Answer

A)  a sampling distribution based on samples of size 50 
B)  a sampling distribution based on samples of size 150 
C)  a sampling distribution based on samples of size 500 
D)  a sampling distribution based on samples of size 1,500 
A)  a sampling distribution based on samples of size 50 
B)  a sampling distribution based on samples of size 150 
C)  a sampling distribution based on samples of size 500 
D)  a sampling distribution based on samples of size 1,500

Question 20

A researcher takes a sample of 500 executives in large U.S. corporations. In the sample the average annual income for the executives is $500,000. Our researcher estimates the value of the standard error to be $10,000. Complete the following statements: "The sample result was $500,000 with a margin of error of ___________ and a level of confidence of 95 percent."

Accepted Answer

A)  $1,000 
B)  $10,000 
C)  $20,000 
D)  $480,000 
A)  $1,000 
B)  $10,000 
C)  $20,000 
D)  $480,000

What are confidence intervals, confidence levels, and margins of error?

Which of the following statements is correct?

A researcher measured the pulse of a random sample of students finishing the SAT exam. The results of the study were sample size = 25, sample mean = 80, and sample standard deviation = 20. What is the best estimate for the standard error of the sampling distribution?

Which of the following statements is correct?

A researcher takes a random sample from a population. What is the percent chance the sample result will be within two standard errors of the true value in the population?

Which sampling distribution will typically have the smallest standard error?

If a researcher wants to make a statement with a 95% level of confidence, the margin of error is the standard error multiplied by

What is the difference between a frequency distribution and a sampling distribution?

Why do researchers prefer sampling distributions with small standard errors?

One thousand researchers each take random samples of 1,000 Americans and ask their age. The sampling distribution has a standard error of 0.5 years. If the true average age of the population is 38, what percent of the researchers will get an average sample age between 36.5 and 39.5 years?

What kinds of questions can you answer using the properties of sampling distributions and normal distributions?

A sampling distribution has a mean of 100 and a standard error of 2. What percent of samples will get sample results between 98 and 102?

A _____ shows how frequently particular statistical results would occur if every possible sample of a particular size from a particular population were taken.

A measure of dispersion for a sampling distribution is the

Which of the following sampling procedures will support inferential statistics?

The difference between a sample result and a census result is the

Which sampling distribution will typically have the smallest standard error?

Introduction

Data Sets

Frequency Tables and Univariate Charts

Central Tendency and Dispersion

Creating New Variables

Comparing Group Means

Crosstab Tables

Nominal and Ordinal Measures of Association

Pearsons Correlation and Bivariate Regression

Multiple Regression

Hypothesis Testing and One-Sample T Tests

Paired and Independent-Samples T Tests

Analysis of Variance

Chi-Square

Hypothesis Testing With Measures of Association and Regression

Filters

Exam 11: Sampling Distributions and Normal Distributions

What are confidence intervals, confidence levels, and margins of error?

Which of the following statements is correct?

A researcher measured the pulse of a random sample of students finishing the SAT exam. The results of the study were sample size = 25, sample mean = 80, and sample standard deviation = 20. What is the best estimate for the standard error of the sampling distribution?

Which of the following statements is correct?

A researcher takes a random sample from a population. What is the percent chance the sample result will be within two standard errors of the true value in the population?

Which sampling distribution will typically have the smallest standard error?

If a researcher wants to make a statement with a 95% level of confidence, the margin of error is the standard error multiplied by

What is the difference between a frequency distribution and a sampling distribution?

Why do researchers prefer sampling distributions with small standard errors?

One thousand researchers each take random samples of 1,000 Americans and ask their age. The sampling distribution has a standard error of 0.5 years. If the true average age of the population is 38, what percent of the researchers will get an average sample age between 36.5 and 39.5 years?

What kinds of questions can you answer using the properties of sampling distributions and normal distributions?

A sampling distribution has a mean of 100 and a standard error of 2. What percent of samples will get sample results between 98 and 102?

A _____ shows how frequently particular statistical results would occur if every possible sample of a particular size from a particular population were taken.

A measure of dispersion for a sampling distribution is the

Which of the following sampling procedures will support inferential statistics?

The difference between a sample result and a census result is the

Which sampling distribution will typically have the smallest standard error?

Introduction

Data Sets

Frequency Tables and Univariate Charts

Central Tendency and Dispersion

Creating New Variables

Comparing Group Means

Crosstab Tables

Nominal and Ordinal Measures of Association

Pearsons Correlation and Bivariate Regression

Multiple Regression

Hypothesis Testing and One-Sample T Tests

Paired and Independent-Samples T Tests

Analysis of Variance

Chi-Square

Hypothesis Testing With Measures of Association and Regression

Filters