Question 1

The only reliable way a researcher can make statistical inferences from a sample to a population is to use nonprobability sampling methods.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following yields a systematic sample?

Accepted Answer

A)  All students in a class are divided into groups of 15. One student is randomly chosen from the first 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 drawn from the females. 
D)  A random sample of 15 students is selected from a class without replacement. 
A)  All students in a class are divided into groups of 15. One student is randomly chosen from the first 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 drawn from the females. 
D)  A random sample of 15 students is selected from a class without replacement.

Question 3

TABLE 7-6
According to an article, 19% of the entire population in a developing country have high-speed access to the Internet. Random samples of size 200 are selected from the country's population.
-Referring to Table 7-6, the standard error of all the sample proportions is ________.

Accepted Answer

The answer of TABLE 7-6
According to an article, 19% of...

Question 4

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 5

The standard error of the population proportion will become larger

Accepted Answer

A)  as the population proportion approaches 0. 
B)  as the population proportion approaches 0.50. 
C)  as the population proportion approaches 1.00. 
D)  as the sample size increases. 
A)  as the population proportion approaches 0. 
B)  as the population proportion approaches 0.50. 
C)  as the population proportion approaches 1.00. 
D)  as the sample size increases.

Question 6

TABLE 7-3
The mean selling price of new homes in a small town over a year was $115,000. The population standard deviation was $25,000. A random sample of 100 new home sales from this city was taken.
-Referring to Table 7-3, without doing the calculations, state in which of the following ranges the sample mean selling price is most likely to lie.

Accepted Answer

A)  $113,000-$115,000 
B)  $114,000-$116,000 
C)  $115,000-$117,000 
D)  $116,000-$118,000 
A)  $113,000-$115,000 
B)  $114,000-$116,000 
C)  $115,000-$117,000 
D)  $116,000-$118,000

Question 7

The professor of a business statistics class wanted to find out the mean amount of time per week her students spent studying for the class. She divided the fifty students on her roster into ten groups starting from the first student on the roster. The first student was randomly selected from the first group. Then every tenth student was selected from the remaining students. This is an example of a cluster sample.

Accepted Answer

A) True 
 B)False

Question 8

If the population distribution is skewed, in most cases the sampling distribution of the mean can be approximated by the normal distribution if the samples contain at least 30 observations.

Accepted Answer

A) True 
 B)False

Question 9

The Central Limit Theorem is considered powerful in statistics because it works for any population distribution provided the sample size is sufficiently large and the population mean and standard deviation are known.

Accepted Answer

A) True 
 B)False

Question 10

Measurement error can become an ethical issue when a survey sponsor chooses leading questions that guide the responses in a particular direction.

Accepted Answer

A) True 
 B)False

Question 11

A study at a college on the west coast reveals that, historically, 45% of the students are minority students. If random samples of size 75 are selected, the standard error of the proportion of students in the samples who are minority students is ________.

Accepted Answer

The answer of A study at a college on the...

Question 12

Suppose μ = 50 and σ = 10 for a population. In a sample where n = 100 is randomly taken, 95% of all possible sample means will fall between 48.04 and 51.96.

Accepted Answer

A) True 
 B)False

Question 13

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. Above what value do 2.5% of the sample means fall?

Accepted Answer

The answer of At a computer manufacturing company, the actual...

Question 14

A sample of 300 subscribers to a particular magazine is selected from a population frame of 9,000 subscribers. If, upon examining the data, it is determined that no subscriber had been selected in the sample more than once,

Accepted Answer

A)  the sample could not have been random. 
B)  the sample may have been selected without replacement or with replacement. 
C)  the sample had to have been selected with replacement. 
D)  the sample had to have been selected without replacement. 
A)  the sample could not have been random. 
B)  the sample may have been selected without replacement or with replacement. 
C)  the sample had to have been selected with replacement. 
D)  the sample had to have been selected without replacement.

Question 15

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 standard deviation of the sampling distribution of the sample mean is ________ minutes.

Accepted Answer

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

Question 16

As the sample size increases, the standard error of the mean increases.

Accepted Answer

A) True 
 B)False

Question 17

TABLE 7-3
The mean selling price of new homes in a small town over a year was $115,000. The population standard deviation was $25,000. A random sample of 100 new home sales from this city was taken.
-Referring to Table 7-3, what is the probability that the sample mean selling price was between $113,000 and $117,000?

Accepted Answer

0.5763 usi

Question 18

In inferential statistics, the standard error of the sample mean assesses the uncertainty or error of estimation.

Accepted Answer

A) True 
 B)False

Question 19

To obtain a sample of 10 books in the store, the manager walked to the first shelf next to the cash register to pick the first 10 books on that shelf. This is an example of a

Accepted Answer

A)  systematic sample. 
B)  simple random sample. 
C)  stratified sample. 
D)  convenience sample. 
A)  systematic sample. 
B)  simple random sample. 
C)  stratified sample. 
D)  convenience sample.

Question 20

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. So, the middle 95% of the sample means based on samples of size 64 will be between ________ and ________ minutes.

Accepted Answer

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

The only reliable way a researcher can make statistical inferences from a sample to a population is to use nonprobability sampling methods.

Which of the following yields a systematic sample?

TABLE 7-6 According to an article, 19% of the entire population in a developing country have high-speed access to the Internet. Random samples of size 200 are selected from the country's population. -Referring to Table 7-6, the standard error of all the sample proportions is ________.

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

The standard error of the population proportion will become larger

If the population distribution is skewed, in most cases the sampling distribution of the mean can be approximated by the normal distribution if the samples contain at least 30 observations.

The Central Limit Theorem is considered powerful in statistics because it works for any population distribution provided the sample size is sufficiently large and the population mean and standard deviation are known.

Measurement error can become an ethical issue when a survey sponsor chooses leading questions that guide the responses in a particular direction.

A study at a college on the west coast reveals that, historically, 45% of the students are minority students. If random samples of size 75 are selected, the standard error of the proportion of students in the samples who are minority students is ________.

Suppose μ = 50 and σ = 10 for a population. In a sample where n = 100 is randomly taken, 95% of all possible sample means will fall between 48.04 and 51.96.

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. Above what value do 2.5% of the sample means fall?

A sample of 300 subscribers to a particular magazine is selected from a population frame of 9,000 subscribers. If, upon examining the data, it is determined that no subscriber had been selected in the sample more than once,

As the sample size increases, the standard error of the mean increases.

In inferential statistics, the standard error of the sample mean assesses the uncertainty or error of estimation.

To obtain a sample of 10 books in the store, the manager walked to the first shelf next to the cash register to pick the first 10 books on that shelf. This is an example of a

Introduction

Organizing and Visualizing Data

Numerical Descriptive Measures

Basic Probability

Discrete Probability Distributions

The Normal Distribution

Confidence Interval Estimation

Fundamentals of Hypothesis Testing: One-Sample Tests

Two-Sample Tests and One-Way ANOVA

Chi-Square Tests

Simple Linear Regression

Introduction to Multiple Regression

Statistical Applications in Quality Management

Filters

Exam 7: Sampling and Sampling Distributions

The only reliable way a researcher can make statistical inferences from a sample to a population is to use nonprobability sampling methods.

Which of the following yields a systematic sample?

TABLE 7-6 According to an article, 19% of the entire population in a developing country have high-speed access to the Internet. Random samples of size 200 are selected from the country's population. -Referring to Table 7-6, the standard error of all the sample proportions is ________.

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

The standard error of the population proportion will become larger

If the population distribution is skewed, in most cases the sampling distribution of the mean can be approximated by the normal distribution if the samples contain at least 30 observations.

The Central Limit Theorem is considered powerful in statistics because it works for any population distribution provided the sample size is sufficiently large and the population mean and standard deviation are known.

Measurement error can become an ethical issue when a survey sponsor chooses leading questions that guide the responses in a particular direction.

A study at a college on the west coast reveals that, historically, 45% of the students are minority students. If random samples of size 75 are selected, the standard error of the proportion of students in the samples who are minority students is ________.

Suppose μ = 50 and σ = 10 for a population. In a sample where n = 100 is randomly taken, 95% of all possible sample means will fall between 48.04 and 51.96.

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. Above what value do 2.5% of the sample means fall?

A sample of 300 subscribers to a particular magazine is selected from a population frame of 9,000 subscribers. If, upon examining the data, it is determined that no subscriber had been selected in the sample more than once,

As the sample size increases, the standard error of the mean increases.

In inferential statistics, the standard error of the sample mean assesses the uncertainty or error of estimation.

To obtain a sample of 10 books in the store, the manager walked to the first shelf next to the cash register to pick the first 10 books on that shelf. This is an example of a

Introduction

Organizing and Visualizing Data

Numerical Descriptive Measures

Basic Probability

Discrete Probability Distributions

The Normal Distribution

Confidence Interval Estimation

Fundamentals of Hypothesis Testing: One-Sample Tests

Two-Sample Tests and One-Way ANOVA

Chi-Square Tests

Simple Linear Regression

Introduction to Multiple Regression

Statistical Applications in Quality Management

Filters