Question 1

True or False: The sample proportion is an unbiased estimate of the population proportion.

Accepted Answer

A) True 
 B)False

Question 2

True or False: If the amount of gasoline purchased per car at a large service station has a
population mean of 15 gallons and a population standard deviation of 4 gallons and a random
sample of 64 cars is selected, there is approximately a 95.44% chance that the sample mean will
be between 14 and 16 gallons.

Accepted Answer

A) True 
 B)False

Question 3

Accepted Answer

A) True 
 B)False

Question 4

The standard error of the population proportion will become larger

Accepted Answer

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

Question 5

The distribution of the number of loaves of bread sold per week by a large bakery over the past 5
years has a mean of 7,750 and a standard deviation of 145 loaves.Suppose a random sample of n
= 40 weeks has been selected.What is the approximate probability that the mean number of
loaves sold in the sampled weeks exceeds 7,895 loaves?

Accepted Answer

The answer of The distribution of the number of loaves...

Question 6

True or False: If the amount of gasoline purchased per car at a large service station has a
population mean of 15 gallons and a population standard deviation of 4 gallons and it is assumed
that the amount of gasoline purchased per car is symmetric, there is approximately a 68.26%
chance that a random sample of 16 cars will have a sample mean between 14 and 16 gallons.

Accepted Answer

A) True 
 B)False

Question 7

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in
A certain year in the past.Suppose a sample of 100 major league players was taken.Find the
Approximate probability that the mean salary of the 100 players exceeded $3.5 million.

Accepted Answer

A)  Approximately 0 
B)  0.0228 
C)  0.9772 
D)  Approximately 1 
A)  Approximately 0 
B)  0.0228 
C)  0.9772 
D)  Approximately 1

Question 8

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in
A certain year in the past.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 9

Which of the following is true about the sampling distribution of the sample mean?

Accepted Answer

A)  The mean of the sampling distribution is always   
B)  The standard deviation of the sampling distribution is always   
C)  The shape of the sampling distribution is always approximately normal. 
D)  All of the above are true. 
A)  The mean of the sampling distribution is always   
B)  The standard deviation of the sampling distribution is always   
C)  The shape of the sampling distribution is always approximately normal. 
D)  All of the above are true.

Question 10

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in
A certain year in the past.Suppose a sample of 100 major league players was taken.Find the
Approximate probability that the mean salary of the 100 players exceeded $4.0 million.

Accepted Answer

A)  Approximately 0 
B)  0.0228 
C)  0.9772 
D)  Approximately 1 
A)  Approximately 0 
B)  0.0228 
C)  0.9772 
D)  Approximately 1

Question 11

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 12

True or False: The sample mean is an unbiased estimator for the population mean.

Accepted Answer

A) True 
 B)False

Question 13

.

Accepted Answer

Question 14

True or False: The amount of bleach a machine pours into bottles has a mean of 36 oz.with a
standard deviation of 0.15 oz.Suppose we take a random sample of 36 bottles filled by this
machine.The sampling distribution of the sample mean has a standard error of 0.15.

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

True or False: The amount of time it takes to complete an examination has a left skewed
distribution with a mean of 65 minutes and a standard deviation of 8 minutes.If 64 students were
randomly sampled, the probability that the sample mean of the sampled students exceeds 71
minutes is approximately 0.

Accepted Answer

A) True 
 B)False

Question 17

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 18

Which of the following is true regarding the sampling distribution of the mean for a large sample
Size?

Accepted Answer

A)  It has the same shape, mean, and standard deviation as the population. 
B)  It has a normal distribution with the same mean and standard deviation as the population. 
C)  It has the same shape and mean as the population, but has a smaller standard deviation. 
D)  It has a normal distribution with the same mean as the population but with a smaller standard deviation. 
A)  It has the same shape, mean, and standard deviation as the population. 
B)  It has a normal distribution with the same mean and standard deviation as the population. 
C)  It has the same shape and mean as the population, but has a smaller standard deviation. 
D)  It has a normal distribution with the same mean as the population but with a smaller standard deviation.

Question 19

Accepted Answer

A) True 
 B)False

Question 20

True or False: 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

True or False: The sample proportion is an unbiased estimate of the population proportion.

The standard error of the population proportion will become larger

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in A certain year in the past.Suppose a sample of 100 major league players was taken.Find the Approximate probability that the mean salary of the 100 players exceeded $3.5 million.

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in A certain year in the past.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.

Which of the following is true about the sampling distribution of the sample mean?

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in A certain year in the past.Suppose a sample of 100 major league players was taken.Find the Approximate probability that the mean salary of the 100 players exceeded $4.0 million.

True or False: The sample mean is an unbiased estimator for the population mean.

.

True or False: The amount of bleach a machine pours into bottles has a mean of 36 oz.with a standard deviation of 0.15 oz.Suppose we take a random sample of 36 bottles filled by this machine.The sampling distribution of the sample mean has a standard error of 0.15.

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

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

Which of the following is true regarding the sampling distribution of the mean for a large sample Size?

True or False: 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.

Defining and Collecting Data

Organizing and Visualizing

Numerical Descriptive Measures

Basic Probability

Discrete Probability Distributions

Conthe Tinuonormausl Disdis Tributionstribution and Other

Confidence Interval Estimation

Fundamentals of Hypothesis Testing: One-Sample Tests

Two-Sample Tests

Analysis of Variance

Chi-Square and Nonparametric

Simple Linear Regression

Introduction to Multiple

Multiple Regression

Time-Series Forecasting

Business Analytics

A Roadmap for Analyzing Data

Statistical Applications in Quality Management

Decision Making

Filters

Exam 7: Sampling Distributions

True or False: The sample proportion is an unbiased estimate of the population proportion.

The standard error of the population proportion will become larger

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in A certain year in the past.Suppose a sample of 100 major league players was taken.Find the Approximate probability that the mean salary of the 100 players exceeded $3.5 million.

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in A certain year in the past.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.

Which of the following is true about the sampling distribution of the sample mean?

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in A certain year in the past.Suppose a sample of 100 major league players was taken.Find the Approximate probability that the mean salary of the 100 players exceeded $4.0 million.

True or False: The sample mean is an unbiased estimator for the population mean.

.

True or False: The amount of bleach a machine pours into bottles has a mean of 36 oz.with a standard deviation of 0.15 oz.Suppose we take a random sample of 36 bottles filled by this machine.The sampling distribution of the sample mean has a standard error of 0.15.

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

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

Which of the following is true regarding the sampling distribution of the mean for a large sample Size?

True or False: 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.

Defining and Collecting Data

Organizing and Visualizing

Numerical Descriptive Measures

Basic Probability

Discrete Probability Distributions

Conthe Tinuonormausl Disdis Tributionstribution and Other

Confidence Interval Estimation

Fundamentals of Hypothesis Testing: One-Sample Tests

Two-Sample Tests

Analysis of Variance

Chi-Square and Nonparametric

Simple Linear Regression

Introduction to Multiple

Multiple Regression

Time-Series Forecasting

Business Analytics

A Roadmap for Analyzing Data

Statistical Applications in Quality Management

Decision Making

Filters