Question 1

If a researcher selects every kth item from a population of N items,then she is likely conducting a systematic random sampling.

Accepted Answer

A) True 
 B)False

Question 2

Catherine Chao,Director of Marketing Research,needs a sample of Kansas City households to participate in the testing of a new toothpaste package. If 40% of the households in Kansas City prefer the new package,the probability that Catherine's random sample of 300 households will have a sample proportion between 0.35 and 0.45 is ___________.

Accepted Answer

A)  0.9232 
B)  0.0768 
C)  0.4616 
D)  0.0384 
E)  0.8976 
A)  0.9232 
B)  0.0768 
C)  0.4616 
D)  0.0384 
E)  0.8976

Question 3

The two major categories of sampling methods are proportionate and disproportionate sampling.

Accepted Answer

A) True 
 B)False

Question 4

A major limitation of nonrandom samples is that they are not appropriate for most statistical methods.

Accepted Answer

A) True 
 B)False

Question 5

In an instant lottery,your chance of winning is 0.1.If you play the lottery 100 times and outcomes are independent,the probability that you win at least 15 percent of the time is

Accepted Answer

A)  0.4933 
B)  0.5 
C)  .15 
D)  0.0478 
E)  0.9213 
A)  0.4933 
B)  0.5 
C)  .15 
D)  0.0478 
E)  0.9213

Question 6

The mean of the sample means is the same as the mean of the population

Accepted Answer

A) True 
 B)False

Question 7

Suppose a population has a mean of 400 and a standard deviation of 24.If a random sample of size 144 is drawn from the population,the probability of drawing a sample with a mean of more than 404.5 is _______.

Accepted Answer

A)  0.0139 
B)  0.4861 
C)  0.4878 
D)  0.0122 
E)  0.5000 
A)  0.0139 
B)  0.4861 
C)  0.4878 
D)  0.0122 
E)  0.5000

Question 8

Alice Zhong is the VP of operations at Pearl Financial Services.She wants to measure customer satisfaction after a new website and other changes were introduced a few months ago.For this purpose,she instructs her staff to prepare a questionnaire and send it to the first 200 clients in their alphabetical list of active clients.This is an example of ______.

Accepted Answer

A)  simple random sample 
B)  systematic sample 
C)  convenience sample 
D)  stratified sample 
E)  cluster sample 
A)  simple random sample 
B)  systematic sample 
C)  convenience sample 
D)  stratified sample 
E)  cluster sample

Question 9

A carload of steel rods has arrived at Cybermatic Construction Company. The car contains 50,000 rods. Claude Ong,manager of Quality Assurance,directs his crew measure the lengths of 100 randomly selected rods. If the population of rods has a mean length of 120 inches and a standard deviation of 0.05 inch,the probability that Claude's sample has a mean between 119.985 and 120.0125 inches is ____________.

Accepted Answer

A)  0.9925 
B)  0.9974 
C)  0.9876 
D)  0.9544 
E)  0.9044 
A)  0.9925 
B)  0.9974 
C)  0.9876 
D)  0.9544 
E)  0.9044

Question 10

A sampling distribution is the distribution of a sample statistic such as the sample mean or sample proportion.

Accepted Answer

A) True 
 B)False

Question 11

Suppose 65% of all college students have a laptop computer at home and a sample of 150 is taken.The standard deviation of the sampling distribution of   is

Accepted Answer

A)  0.0015 
B)  0.0389 
C)  0.6500 
D)  0.4769 
E)  0.0477 
A)  0.0015 
B)  0.0389 
C)  0.6500 
D)  0.4769 
E)  0.0477

Question 12

A population list,map,directory,or other source used to represent the population from which a sample is taken is called a frame.

Accepted Answer

A) True 
 B)False

Question 13

Increasing the sample size causes the numerical value of standard error of the sample means to increase.

Accepted Answer

A) True 
 B)False

Question 14

In a random sampling technique,every unit of the population has a randomly varying chance or probability of being included in the sample.

Accepted Answer

A) True 
 B)False

Question 15

A carload of steel rods has arrived at Cybermatic Construction Company. The car contains 50,000 rods. Claude Ong,manager of Quality Assurance,directs his crew measure the lengths of 100 randomly selected rods. If the population of rods have a mean length of 120 inches and a standard deviation of 0.05 inch,the probability that Claude's sample has a mean less than 119.985 inches is _____________.

Accepted Answer

A)  0.9974 
B)  0.0026 
C)  0.4987 
D)  0.0013 
E)  0.0030 
A)  0.9974 
B)  0.0026 
C)  0.4987 
D)  0.0013 
E)  0.0030

Question 16

The sampling distribution of the sample means is less variable than the population distribution.

Accepted Answer

A) True 
 B)False

Question 17

A random sample of size 100 is drawn from a population with a standard deviation of 10.If only 5% of the time a sample mean greater than 20 is obtained,the mean of the population is ______

Accepted Answer

A)  18.35 
B)  16.25 
C)  17.2 
D)  20 
E)  19 
A)  18.35 
B)  16.25 
C)  17.2 
D)  20 
E)  19

Question 18

Paige DeMarco is the Vice President for University Advancement at State University. She is responsible for the capital campaign to raise money for the new student services building.Paige selects the first 100 alumni listed on a web-based social networking site for State University.She intends to contact these individuals regarding possible donations.Her sample is a _________.

Accepted Answer

A)  simple random sample 
B)  stratified sample 
C)  systematic sample 
D)  convenience sample 
E)  cluster sample 
A)  simple random sample 
B)  stratified sample 
C)  systematic sample 
D)  convenience sample 
E)  cluster sample

Question 19

Suppose the population of all public Universities shows the annual parking fee per student is $110 with a standard deviation of $18.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a mean of more than $115 is _______.

Accepted Answer

A)  0.9738 
B)  0.4738 
C)  0.0262 
D)  0.6103 
E)  0.1103 
A)  0.9738 
B)  0.4738 
C)  0.0262 
D)  0.6103 
E)  0.1103

Question 20

The employees in certain division of Cybertronics Inc.need to complete a certification online.On average,it takes 20 hours to complete the coursework and successfully pass all tests,and the standard deviation is 6 hours.If you select a random sample of size 30,the probability that the employees in your sample have taken,on average,more than 20.5 hours is ______.

Accepted Answer

A)  0.47 
B)  0.45 
C)  0.41 
D)  0.32 
E)  0.01 
A)  0.47 
B)  0.45 
C)  0.41 
D)  0.32 
E)  0.01

If a researcher selects every k^th item from a population of N items,then she is likely conducting a systematic random sampling.

The two major categories of sampling methods are proportionate and disproportionate sampling.

A major limitation of nonrandom samples is that they are not appropriate for most statistical methods.

In an instant lottery,your chance of winning is 0.1.If you play the lottery 100 times and outcomes are independent,the probability that you win at least 15 percent of the time is

The mean of the sample means is the same as the mean of the population

Suppose a population has a mean of 400 and a standard deviation of 24.If a random sample of size 144 is drawn from the population,the probability of drawing a sample with a mean of more than 404.5 is _______.

A sampling distribution is the distribution of a sample statistic such as the sample mean or sample proportion.

Suppose 65% of all college students have a laptop computer at home and a sample of 150 is taken.The standard deviation of the sampling distribution of is

A population list,map,directory,or other source used to represent the population from which a sample is taken is called a frame.

Increasing the sample size causes the numerical value of standard error of the sample means to increase.

In a random sampling technique,every unit of the population has a randomly varying chance or probability of being included in the sample.

The sampling distribution of the sample means is less variable than the population distribution.

A random sample of size 100 is drawn from a population with a standard deviation of 10.If only 5% of the time a sample mean greater than 20 is obtained,the mean of the population is ______

Suppose the population of all public Universities shows the annual parking fee per student is $110 with a standard deviation of $18.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a mean of more than $115 is _______.

Introduction to Statistics

Charts and Graphs

Descriptive Statistics

Probability

Discrete Distributions

Continuous Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

A Nalysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters

Exam 7: Sampling and Sampling Distributions

If a researcher selects every kth item from a population of N items,then she is likely conducting a systematic random sampling.

The two major categories of sampling methods are proportionate and disproportionate sampling.

A major limitation of nonrandom samples is that they are not appropriate for most statistical methods.

In an instant lottery,your chance of winning is 0.1.If you play the lottery 100 times and outcomes are independent,the probability that you win at least 15 percent of the time is

The mean of the sample means is the same as the mean of the population

Suppose a population has a mean of 400 and a standard deviation of 24.If a random sample of size 144 is drawn from the population,the probability of drawing a sample with a mean of more than 404.5 is _______.

A sampling distribution is the distribution of a sample statistic such as the sample mean or sample proportion.

Suppose 65% of all college students have a laptop computer at home and a sample of 150 is taken.The standard deviation of the sampling distribution of is

A population list,map,directory,or other source used to represent the population from which a sample is taken is called a frame.

Increasing the sample size causes the numerical value of standard error of the sample means to increase.

In a random sampling technique,every unit of the population has a randomly varying chance or probability of being included in the sample.

The sampling distribution of the sample means is less variable than the population distribution.

A random sample of size 100 is drawn from a population with a standard deviation of 10.If only 5% of the time a sample mean greater than 20 is obtained,the mean of the population is ______

Suppose the population of all public Universities shows the annual parking fee per student is $110 with a standard deviation of $18.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a mean of more than $115 is _______.

Introduction to Statistics

Charts and Graphs

Descriptive Statistics

Probability

Discrete Distributions

Continuous Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

A Nalysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Nonparametric Statistics

Statistical Quality Control

Decision Analysis

Filters

If a researcher selects every k^th item from a population of N items,then she is likely conducting a systematic random sampling.