Question 1

The sample proportion is an unbiased estimate of the population proportion.

Accepted Answer

A) True 
 B)False

Question 2

Suppose a sample of n = 50 items is selected from a population of manufactured products and the weight, X, of each item is recorded. Prior experience has shown that the weight has a probability distribution with μ = 6 ounces and σ = 2.5 ounces. Which of the following is true about the sampling distribution of the sample mean if a sample of size 15 is selected?

Accepted Answer

A)  The mean of the sampling distribution is 6 ounces. 
B)  The standard deviation of the sampling distribution is 2.5 ounces. 
C)  The shape of the sampling distribution is approximately normal. 
D)  All of the above are correct. 
A)  The mean of the sampling distribution is 6 ounces. 
B)  The standard deviation of the sampling distribution is 2.5 ounces. 
C)  The shape of the sampling distribution is approximately normal. 
D)  All of the above are correct.

Question 3

Which of the following sampling methods is a probability sample?

Accepted Answer

A)  convenience sample 
B)  quota sample 
C)  stratified sample 
D)  judgment sample 
A)  convenience sample 
B)  quota sample 
C)  stratified sample 
D)  judgment sample

Question 4

An unbiased estimator will have a value, on average across samples, equal to the population parameter value.

Accepted Answer

A) True 
 B)False

Question 5

The standard error of the mean

Accepted Answer

A)  is never larger than the standard deviation of the population. 
B)  decreases as the sample size increases. 
C)  measures the variability of the mean from sample to sample. 
D)  all of the above 
A)  is never larger than the standard deviation of the population. 
B)  decreases as the sample size increases. 
C)  measures the variability of the mean from sample to sample. 
D)  all of the above

Question 6

A telemarketer set the company's computerized dialing system to contact every 25th person listed in the local telephone directory. What sampling method was used?

Accepted Answer

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

Question 7

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. What was the standard error for the sample mean salary?

Accepted Answer

A)  $0.012 million 
B)  $0.12 million 
C)  $12 million 
D)  $1,200.0 million 
A)  $0.012 million 
B)  $0.12 million 
C)  $12 million 
D)  $1,200.0 million

Question 8

Since a ________ is not a randomly selected probability sample, there is no way to know how well it represents the overall population.

Accepted Answer

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

Question 9

The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with mean of 3.2 pounds and standard deviation of 0.8 pound. What percentage of samples of 4 fish will have sample means between 3.0 and 4.0 pounds?

Accepted Answer

A)  84% 
B)  67% 
C)  29% 
D)  16% 
A)  84% 
B)  67% 
C)  29% 
D)  16%

Question 10

To find out the potential impact of a new zoning law on a neighborhood, the legislators conduct a focus group interview by inviting the members of the housing owners association of that neighborhood. This is an example of a

Accepted Answer

A)  systematic sample. 
B)  simple random sample. 
C)  judgment sample. 
D)  cluster sample. 
A)  systematic sample. 
B)  simple random sample. 
C)  judgment sample. 
D)  cluster sample.

Question 11

________ results from the failure to collect data on all subjects in the sample.

Accepted Answer

Nonrespons

Question 12

The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with mean of 3.2 pounds and standard deviation of 0.8 pound. If a sample of 25 fish yields a mean of 3.6 pounds, what is the Z-score for this observation?

Accepted Answer

A)  18.750 
B)  2.500 
C)  1.875 
D)  0.750 
A)  18.750 
B)  2.500 
C)  1.875 
D)  0.750

Question 13

Which of the following yields a simple random 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)  The names of 50 students in a class are written on 50 different pieces of paper and put in a hat. The first 15 pieces of paper are selected blindly one at a time without replacing them back in the hat after shuffling the papers thoroughly. 
D)  All students in a class are divided into groups according to the rows in which 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 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)  The names of 50 students in a class are written on 50 different pieces of paper and put in a hat. The first 15 pieces of paper are selected blindly one at a time without replacing them back in the hat after shuffling the papers thoroughly. 
D)  All students in a class are divided into groups according to the rows in which they are seated. One of the groups is randomly selected.

Question 14

Sampling distributions describe the distribution of

Accepted Answer

A)  parameters. 
B)  statistics. 
C)  both parameters and statistics. 
D)  neither parameters nor statistics. 
A)  parameters. 
B)  statistics. 
C)  both parameters and statistics. 
D)  neither parameters nor statistics.

Question 15

Sales prices of baseball cards from the 1960s are known to possess a right-skewed distribution with a mean sale price of $5.25 and a standard deviation of $2.80. Suppose a random sample of 100 cards from the 1960s is selected. Describe the sampling distribution for the sample mean sale price of the selected cards.

Accepted Answer

A)  right skewed with a mean of $5.25 and a standard error of $2.80 
B)  normal with a mean of $5.25 and a standard error of $0.28 
C)  right skewed with a mean of $5.25 and a standard error of $0.28 
D)  normal with a mean of $5.25 and a standard error of $2.80 
A)  right skewed with a mean of $5.25 and a standard error of $2.80 
B)  normal with a mean of $5.25 and a standard error of $0.28 
C)  right skewed with a mean of $5.25 and a standard error of $0.28 
D)  normal with a mean of $5.25 and a standard error of $2.80

Question 16

The question "Is your household income last year somewhere between $50,000 and $100,000?" will most likely result in coverage error.

Accepted Answer

A) True 
 B)False

Question 17

TABLE 7-5
According to a survey, only 15% of customers who visited the web site of a major retail store made a purchase. Random samples of size 50 are selected.
-Referring to Table 7-5, what is the probability that a random sample of 50 will have at least 30% of customers who will make a purchase after visiting the web site?

Accepted Answer

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

Question 18

The fact that the sample means are less variable than the population data can be observed from the standard error of the mean.

Accepted Answer

A) True 
 B)False

Question 19

The amount of tea leaves in a can from a particular production line is normally distributed with μ = 110 grams and σ = 25 grams. A sample of 25 cans is to be selected. So, 95% of all sample means will be greater than how many grams?

Accepted Answer

The answer of The amount of tea leaves in a...

Question 20

TABLE 7-5
According to a survey, only 15% of customers who visited the web site of a major retail store made a purchase. Random samples of size 50 are selected.
-Referring to Table 7-5, the mean of all the sample proportions of customers who will make a purchase after visiting the web site is ________.

Accepted Answer

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

The sample proportion is an unbiased estimate of the population proportion.

Which of the following sampling methods is a probability sample?

An unbiased estimator will have a value, on average across samples, equal to the population parameter value.

The standard error of the mean

A telemarketer set the company's computerized dialing system to contact every 25th person listed in the local telephone directory. What sampling method was used?

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. What was the standard error for the sample mean salary?

Since a ________ is not a randomly selected probability sample, there is no way to know how well it represents the overall population.

The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with mean of 3.2 pounds and standard deviation of 0.8 pound. What percentage of samples of 4 fish will have sample means between 3.0 and 4.0 pounds?

To find out the potential impact of a new zoning law on a neighborhood, the legislators conduct a focus group interview by inviting the members of the housing owners association of that neighborhood. This is an example of a

________ results from the failure to collect data on all subjects in the sample.

The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with mean of 3.2 pounds and standard deviation of 0.8 pound. If a sample of 25 fish yields a mean of 3.6 pounds, what is the Z-score for this observation?

Which of the following yields a simple random sample?

Sampling distributions describe the distribution of

The question "Is your household income last year somewhere between $50,000 and $100,000?" will most likely result in coverage error.

The fact that the sample means are less variable than the population data can be observed from the standard error of the mean.

The amount of tea leaves in a can from a particular production line is normally distributed with μ = 110 grams and σ = 25 grams. A sample of 25 cans is to be selected. So, 95% of all sample means will be greater than how many grams?

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 sample proportion is an unbiased estimate of the population proportion.

Which of the following sampling methods is a probability sample?

An unbiased estimator will have a value, on average across samples, equal to the population parameter value.

The standard error of the mean

A telemarketer set the company's computerized dialing system to contact every 25th person listed in the local telephone directory. What sampling method was used?

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. What was the standard error for the sample mean salary?

Since a ________ is not a randomly selected probability sample, there is no way to know how well it represents the overall population.

The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with mean of 3.2 pounds and standard deviation of 0.8 pound. What percentage of samples of 4 fish will have sample means between 3.0 and 4.0 pounds?

To find out the potential impact of a new zoning law on a neighborhood, the legislators conduct a focus group interview by inviting the members of the housing owners association of that neighborhood. This is an example of a

________ results from the failure to collect data on all subjects in the sample.

The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with mean of 3.2 pounds and standard deviation of 0.8 pound. If a sample of 25 fish yields a mean of 3.6 pounds, what is the Z-score for this observation?

Which of the following yields a simple random sample?

Sampling distributions describe the distribution of

The question "Is your household income last year somewhere between $50,000 and $100,000?" will most likely result in coverage error.

The fact that the sample means are less variable than the population data can be observed from the standard error of the mean.

The amount of tea leaves in a can from a particular production line is normally distributed with μ = 110 grams and σ = 25 grams. A sample of 25 cans is to be selected. So, 95% of all sample means will be greater than how many grams?

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