Question 1

Why is the Central Limit Theorem so important to the study of sampling distributions?

Accepted Answer

A)  It allows us to disregard the size of the sample selected when the population is not normal. 
B)  It allows us to disregard the shape of the sampling distribution when the size of the population is large. 
C)  It allows us to disregard the size of the population we are sampling from. 
D)  It allows us to disregard the shape of the population when n is large. 
A)  It allows us to disregard the size of the sample selected when the population is not normal. 
B)  It allows us to disregard the shape of the sampling distribution when the size of the population is large. 
C)  It allows us to disregard the size of the population we are sampling from. 
D)  It allows us to disregard the shape of the population when n is large.

Question 2

TABLE 7-5
According to a survey, only 15% of customers who visited the website of a major retail store made a purchase. Random samples of size 50 are selected.
-Referring to Table 7-5, the requirements for using a normal distribution to approximate a binomial distribution is fulfilled.

Accepted Answer

A) True 
 B)False

Question 3

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in a recent year. Suppose a sample of 100 major league players was taken. Find the approximate probability that the mean salary of the 100 players was less than $2.5 million.

Accepted Answer

A)  Approximately 0 
B)  0.0151 
C)  0.9849 
D)  Approximately 1 
A)  Approximately 0 
B)  0.0151 
C)  0.9849 
D)  Approximately 1

Question 4

TABLE 7-5
According to a survey, only 15% of customers who visited the website of a major retail store made a purchase. Random samples of size 50 are selected.
-A study at a college in the west coast reveals that, historically, 45% of the students are minority students. If a random sample of size 75 is selected, the probability is ________ that more than half of the students in the sample will be minority students.

Accepted Answer

0.1920 usi

Question 5

In a business statistics class students sit randomly without particular preferences. A sample is selected by including everybody who sits in the first row. This is an example of a cluster sample.

Accepted Answer

A) True 
 B)False

Question 6

The sampling process begins by locating appropriate data sources called ________.

Accepted Answer

The answer of The sampling process begins by locating appropriate...

Question 7

Which of the following yields a cluster sample?

Accepted Answer

A)  All students in a class are divided into groups of 15. One student is randomly chosen from the 1st group, the remaining observations are every 15th student thereafter. 
B)  The best 15 students, according to the opinion of the instructor, in a class are selected. 
C)  All students in a class are grouped according to their gender. A random sample of 8 is selected from the males and a separate random sample of 7 is selected from the females. 
D)  All students in a class are divided into groups according to the rows that they are seated. One of the groups is randomly selected. 
A)  All students in a class are divided into groups of 15. One student is randomly chosen from the 1st group, the remaining observations are every 15th student thereafter. 
B)  The best 15 students, according to the opinion of the instructor, in a class are selected. 
C)  All students in a class are grouped according to their gender. A random sample of 8 is selected from the males and a separate random sample of 7 is selected from the females. 
D)  All students in a class are divided into groups according to the rows that they are seated. One of the groups is randomly selected.

Question 8

The amount of time required for an oil and filter change on an automobile is normally distributed with a mean of 45 minutes and a standard deviation of 10 minutes. A random sample of 16 cars is selected. 95% of all sample means will fall between what two values?

Accepted Answer

40.1 and 4

Question 9

At a computer manufacturing company, the actual size of computer chips is normally distributed with a mean of 1 centimeter and a standard deviation of 0.1 centimeter. A random sample of 12 computer chips is taken. What is the standard error for the sample mean?

Accepted Answer

A)  0.029 
B)  0.050 
C)  0.091 
D)  0.120 
A)  0.029 
B)  0.050 
C)  0.091 
D)  0.120

Question 10

For sample size 16, the sampling distribution of the mean will be approximately normally distributed

Accepted Answer

A)  regardless of the shape of the population. 
B)  if the shape of the population is symmetrical. 
C)  if the sample standard deviation is known. 
D)  if the sample is normally distributed. 
A)  regardless of the shape of the population. 
B)  if the shape of the population is symmetrical. 
C)  if the sample standard deviation is known. 
D)  if the sample is normally distributed.

Question 11

A manufacturer of power tools claims that the mean amount of time required to assemble their top-of-the-line table saw is 80 minutes with a standard deviation of 40 minutes. Suppose a random sample of 64 purchasers of this table saw is taken. The probability that the sample mean will be greater than 88 minutes is ________.

Accepted Answer

The answer of A manufacturer of power tools claims that...

Question 12

For a population frame containing N = 1,007 individuals, what code number should you assign to the first person on the list in order to use a table of random numbers?

Accepted Answer

A)  0 
B)  1 
C)  01 
D)  0001 
A)  0 
B)  1 
C)  01 
D)  0001

Question 13

A sample is always a good representation of the target population.

Accepted Answer

A) True 
 B)False

Question 14

A sample that does not provide a good representation of the population from which it was collected is referred to as a(n)________ sample.

Accepted Answer

The answer of A sample that does not provide a...

Question 15

Coverage error can become an ethical issue if a particular group is intentionally excluded from the frame.

Accepted Answer

A) True 
 B)False

Question 16

A sample of size 25 provides a sample variance of 400. The standard error, in this case equal to 4, is best described as the estimate of the standard deviation of means calculated from samples of size 25.

Accepted Answer

A) True 
 B)False

Question 17

TABLE 7-5
According to a survey, only 15% of customers who visited the website of a major retail store made a purchase. Random samples of size 50 are selected.
-A study at a college in the west coast reveals that, historically, 45% of the students are minority students. If random samples of size 75 are selected, 80% of the samples will have less than ________ % of minority students.

Accepted Answer

The answer of TABLE 7-5
According to a survey, only 15%...

Question 18

TABLE 7-7
Online customer service is a key element to successful online retailing. According to a marketing survey, 37.5% of online customers take advantage of the online customer service. Random samples of 200 customers are selected.
-Referring to Table 7-7, the population mean of all possible sample proportions is ________.

Accepted Answer

The answer of TABLE 7-7
Online customer service is a key...

Question 19

At US Data Corporation's website, they advertised that "Because of our commitment to quality and our vast amount of industry knowledge and experience, we have grown to be one of America's leading providers of mailing lists, marketing data, sales leads and research data. We maintain databases of information on consumers and businesses nationwide that set industry standards for mission critical currency, reliability and accuracy." Trying to reach 500 potential donors for their annual phone donation campaign, a local fire department purchased a list of donors from the company. This list is an example of a

Accepted Answer

A)  population. 
B)  statistic. 
C)  parameter. 
D)  frame. 
A)  population. 
B)  statistic. 
C)  parameter. 
D)  frame.

Question 20

The question: "How much did you earn last year rounded to the nearest hundreds of dollars?" will most likely result in measurement error.

Accepted Answer

A) True 
 B)False

Why is the Central Limit Theorem so important to the study of sampling distributions?

TABLE 7-5 According to a survey, only 15% of customers who visited the website of a major retail store made a purchase. Random samples of size 50 are selected. -Referring to Table 7-5, the requirements for using a normal distribution to approximate a binomial distribution is fulfilled.

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in a recent year. Suppose a sample of 100 major league players was taken. Find the approximate probability that the mean salary of the 100 players was less than $2.5 million.

In a business statistics class students sit randomly without particular preferences. A sample is selected by including everybody who sits in the first row. This is an example of a cluster sample.

The sampling process begins by locating appropriate data sources called ________.

Which of the following yields a cluster sample?

The amount of time required for an oil and filter change on an automobile is normally distributed with a mean of 45 minutes and a standard deviation of 10 minutes. A random sample of 16 cars is selected. 95% of all sample means will fall between what two values?

At a computer manufacturing company, the actual size of computer chips is normally distributed with a mean of 1 centimeter and a standard deviation of 0.1 centimeter. A random sample of 12 computer chips is taken. What is the standard error for the sample mean?

For sample size 16, the sampling distribution of the mean will be approximately normally distributed

For a population frame containing N = 1,007 individuals, what code number should you assign to the first person on the list in order to use a table of random numbers?

A sample is always a good representation of the target population.

A sample that does not provide a good representation of the population from which it was collected is referred to as a(n)________ sample.

Coverage error can become an ethical issue if a particular group is intentionally excluded from the frame.

A sample of size 25 provides a sample variance of 400. The standard error, in this case equal to 4, is best described as the estimate of the standard deviation of means calculated from samples of size 25.

The question: "How much did you earn last year rounded to the nearest hundreds of dollars?" will most likely result in measurement error.

Introduction

Organizing and Visualizing Data

Numerical Descriptive Measures

Basic Probability

Discrete Probability Distributions

The Normal Distribution and Other Continuous Distributions

Confidence Interval Estimation

Fundamentals of Hypothesis Testing: One-Sample Tests

Two-Sample Tests

Analysis of Variance

Chi-Square Tests and Nonparametric Tests

Simple Linear Regression

Introduction to Multiple Regression

Multiple Regression Model Building

Time-Series Forecasting

Statistical Applications in Quality Management

A Roadmap for Analyzing Data

Filters

Exam 7: Sampling and Sampling Distributions

Why is the Central Limit Theorem so important to the study of sampling distributions?

TABLE 7-5 According to a survey, only 15% of customers who visited the website of a major retail store made a purchase. Random samples of size 50 are selected. -Referring to Table 7-5, the requirements for using a normal distribution to approximate a binomial distribution is fulfilled.

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in a recent year. Suppose a sample of 100 major league players was taken. Find the approximate probability that the mean salary of the 100 players was less than $2.5 million.

In a business statistics class students sit randomly without particular preferences. A sample is selected by including everybody who sits in the first row. This is an example of a cluster sample.

The sampling process begins by locating appropriate data sources called ________.

Which of the following yields a cluster sample?

The amount of time required for an oil and filter change on an automobile is normally distributed with a mean of 45 minutes and a standard deviation of 10 minutes. A random sample of 16 cars is selected. 95% of all sample means will fall between what two values?

At a computer manufacturing company, the actual size of computer chips is normally distributed with a mean of 1 centimeter and a standard deviation of 0.1 centimeter. A random sample of 12 computer chips is taken. What is the standard error for the sample mean?

For sample size 16, the sampling distribution of the mean will be approximately normally distributed

For a population frame containing N = 1,007 individuals, what code number should you assign to the first person on the list in order to use a table of random numbers?

A sample is always a good representation of the target population.

A sample that does not provide a good representation of the population from which it was collected is referred to as a(n)________ sample.

Coverage error can become an ethical issue if a particular group is intentionally excluded from the frame.

A sample of size 25 provides a sample variance of 400. The standard error, in this case equal to 4, is best described as the estimate of the standard deviation of means calculated from samples of size 25.

The question: "How much did you earn last year rounded to the nearest hundreds of dollars?" will most likely result in measurement error.

Introduction

Organizing and Visualizing Data

Numerical Descriptive Measures

Basic Probability

Discrete Probability Distributions

The Normal Distribution and Other Continuous Distributions

Confidence Interval Estimation

Fundamentals of Hypothesis Testing: One-Sample Tests

Two-Sample Tests

Analysis of Variance

Chi-Square Tests and Nonparametric Tests

Simple Linear Regression

Introduction to Multiple Regression

Multiple Regression Model Building

Time-Series Forecasting

Statistical Applications in Quality Management

A Roadmap for Analyzing Data

Filters