Question 1

For a population that is not normally distributed, the distribution of the sample means will

Accepted Answer

A)  be negatively skewed. 
B)  approach the normal distribution. 
C)  be positively skewed. 
D)  take the same shape as the population. 
A)  be negatively skewed. 
B)  approach the normal distribution. 
C)  be positively skewed. 
D)  take the same shape as the population.

Question 2

As the sample size (n) increases, what happens to the spread or dispersion of the distribution of the sample means? ___________

Accepted Answer

The answer of As the sample size (n) increases, what...

Question 3

We can expect some difference between sample statistics and the corresponding population parameters. This difference is called the sampling error.

Accepted Answer

A) True 
 B)False

Question 4

In cluster sampling, a population is divided into subgroups called clusters and a sample is randomly selected from each cluster.

Accepted Answer

A) True 
 B)False

Question 5

The standard error of the mean is also called sampling error.

Accepted Answer

A) True 
 B)False

Question 6

The mean weight of trucks traveling on a particular section of I-475 is not known. A state highway inspector needs an estimate of the mean. He selects a random sample of 49 trucks passing the weighing station and finds the mean is 15.8 tons, with a standard deviation of the sample of 4.2 tons. What is probability that a truck will weigh less than 14.3 tons?

Accepted Answer

A)  0.0062 
B)  0.3632 
C)  0.1368 
D)  0.4938 
A)  0.0062 
B)  0.3632 
C)  0.1368 
D)  0.4938

Question 7

Sampling from a population may be preferred because studying all the items in a population may be too ____________.

Accepted Answer

The answer of Sampling from a population may be preferred...

Question 8

A population consists of the following four values: 8, 10, 12, and 16. From this population, there are 6 different samples of size 2. The means of the 6 samples of size 2 are: 9, 10, 12, 11, 13, and 14. Compute the mean of the distribution of the sample means and the population mean. What is true about the two values?

Accepted Answer

Both means are 11.5.

Question 9

An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings. The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140 minutes. What is the probability that the mean completion time is between 1 and 2 hours, i.e., 60 and 120 minutes?

Accepted Answer

A)  Approximately 1 
B)  0.1664 
C)  0.8336 
D)  0.9676 
A)  Approximately 1 
B)  0.1664 
C)  0.8336 
D)  0.9676

Question 10

The standard error of the mean measures the dispersion of the sampling distribution of the sample mean.

Accepted Answer

A) True 
 B)False

Question 11

A university has 1000 computers available for students to use. Each computer has a 250 gigabyte hard drive. The university wants to estimate the space occupied on the hard drives. A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the probability that a sample mean is greater than 120 gigabytes?

Accepted Answer

The answer of A university has 1000 computers available for...

Question 12

Sampling error is the difference between a corresponding sample statistic and the

Accepted Answer

A)  sample mean. 
B)  biased sample. 
C)  population parameter. 
D)  chance error. 
A)  sample mean. 
B)  biased sample. 
C)  population parameter. 
D)  chance error.

Question 13

For a sampling distribution of the means, what percent of the means would be between $\pm$2.576 standard deviations? ________________________

Accepted Answer

The answer of For a sampling distribution of the means,...

Question 14

LongLast Inc. produces car batteries. The mean life of these batteries is 60 months. The distribution of the battery life closely follows the normal probability distribution with a standard deviation of 8 months. As part of its testing program, LongLast tests a sample of 25 batteries. What is the standard error of the mean?

Accepted Answer

The answer of LongLast Inc. produces car batteries. The mean...

Question 15

Which sampling method would be best to use if the population can be divided into homogeneous subgroups? ______________________

Accepted Answer

Stratified

Question 16

Sampling error is defined as

Accepted Answer

A)  (   - µ) 
B)  $\sigma$ 
C)  $\sigma$/n 
D)  N - n 
A)  (   - µ) 
B)  $\sigma$ 
C)  $\sigma$/n 
D)  N - n

Question 17

A university has 1000 computers available for students to use. Each computer has a 250 gigabyte hard drive. The university wants to estimate the space occupied on the hard drives. A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the probability that a sample mean is between 111 and 119 gigabytes?

Accepted Answer

The answer of A university has 1000 computers available for...

Question 18

Truck tire life is normally distributed with a mean of 60,000 miles and a standard deviation of 4,000 miles. You bought four tires. What is the probability that the average mileage of the four tires exceeds 66,000 miles?

Accepted Answer

A)  0.0013 
B)  0.9987 
C)  0.4987 
D)  0.9544 
A)  0.0013 
B)  0.9987 
C)  0.4987 
D)  0.9544

Question 19

For a given population, the mean of all the sample means (   ) of sample size n, and the mean of all (N) population observations (x) are

Accepted Answer

A)  equal to   
B)  not equal 
C)  are equal to (   - x) 
D)  equal to the population mean, µ 
A)  equal to   
B)  not equal 
C)  are equal to (   - x) 
D)  equal to the population mean, µ

Question 20

What is the name of the standard deviation of the sampling distribution of the sample means called? ______________________

Accepted Answer

Standard e

For a population that is not normally distributed, the distribution of the sample means will

As the sample size (n) increases, what happens to the spread or dispersion of the distribution of the sample means? ___________

We can expect some difference between sample statistics and the corresponding population parameters. This difference is called the sampling error.

In cluster sampling, a population is divided into subgroups called clusters and a sample is randomly selected from each cluster.

The standard error of the mean is also called sampling error.

Sampling from a population may be preferred because studying all the items in a population may be too ____________.

The standard error of the mean measures the dispersion of the sampling distribution of the sample mean.

Sampling error is the difference between a corresponding sample statistic and the

For a sampling distribution of the means, what percent of the means would be between $\pm$ 2.576 standard deviations? ________________________

Which sampling method would be best to use if the population can be divided into homogeneous subgroups? ______________________

Sampling error is defined as

Truck tire life is normally distributed with a mean of 60,000 miles and a standard deviation of 4,000 miles. You bought four tires. What is the probability that the average mileage of the four tires exceeds 66,000 miles?

For a given population, the mean of all the sample means ( ) of sample size n, and the mean of all (N) population observations (x) are

What is the name of the standard deviation of the sampling distribution of the sample means called? ______________________

What Is Statistics

Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation

Describing Data: Numerical Measures

Describing Data: Displaying and Exploring Data

A Survey of Probability Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Estimation and Confidence Intervals

One-Sample Tests of Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Correlation and Linear Regression

Multiple Regression Analysis

Index Numbers

Time Series and Forecasting

Nonparametric Methods: Goodness-Of-Fit Tests

Nonparametric Methods: Analysis of Ranked Data

Statistical Process Control and Quality Management

An Introduction to Decision Theory

Filters

Exam 8: Sampling Methods and the Central Limit Theorem

For a population that is not normally distributed, the distribution of the sample means will

As the sample size (n) increases, what happens to the spread or dispersion of the distribution of the sample means? ___________

We can expect some difference between sample statistics and the corresponding population parameters. This difference is called the sampling error.

In cluster sampling, a population is divided into subgroups called clusters and a sample is randomly selected from each cluster.

The standard error of the mean is also called sampling error.

Sampling from a population may be preferred because studying all the items in a population may be too ____________.

The standard error of the mean measures the dispersion of the sampling distribution of the sample mean.

Sampling error is the difference between a corresponding sample statistic and the

For a sampling distribution of the means, what percent of the means would be between ±\pm± 2.576 standard deviations? ________________________

Which sampling method would be best to use if the population can be divided into homogeneous subgroups? ______________________

Sampling error is defined as

Truck tire life is normally distributed with a mean of 60,000 miles and a standard deviation of 4,000 miles. You bought four tires. What is the probability that the average mileage of the four tires exceeds 66,000 miles?

For a given population, the mean of all the sample means ( ) of sample size n, and the mean of all (N) population observations (x) are

What is the name of the standard deviation of the sampling distribution of the sample means called? ______________________

What Is Statistics

Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation

Describing Data: Numerical Measures

Describing Data: Displaying and Exploring Data

A Survey of Probability Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Estimation and Confidence Intervals

One-Sample Tests of Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Correlation and Linear Regression

Multiple Regression Analysis

Index Numbers

Time Series and Forecasting

Nonparametric Methods: Goodness-Of-Fit Tests

Nonparametric Methods: Analysis of Ranked Data

Statistical Process Control and Quality Management

An Introduction to Decision Theory

Filters

For a sampling distribution of the means, what percent of the means would be between $\pm$ 2.576 standard deviations? ________________________