Question 1

Excel's RAND function

Accepted Answer

A) determines sample size 
B) selects a simple random sample 
C) randomizes a population 
D) generates random numbers 
A) determines sample size 
B) selects a simple random sample 
C) randomizes a population 
D) generates random numbers

Question 2

The purpose of statistical inference is to provide information about the

Accepted Answer

A) sample based upon information contained in the population 
B) population based upon information contained in the sample 
C) population based upon information contained in the population 
D) mean of the sample based upon the mean of the population 
A) sample based upon information contained in the population 
B) population based upon information contained in the sample 
C) population based upon information contained in the population 
D) mean of the sample based upon the mean of the population

Question 3

A random sample of 150 people was taken from a very large population. Ninety of the people in the sample were females. The standard error of the proportion of females is

Accepted Answer

A) 0.0016 
B) 0.2400 
C) 0.1600 
D) 0.0400 
A) 0.0016 
B) 0.2400 
C) 0.1600 
D) 0.0400

Question 4

As the sample size becomes larger, the sampling distribution of the sample mean approaches a

Accepted Answer

A) binomial distribution 
B) Poisson distribution 
C) hypergeometric distribution 
D) None of the alternative answers is correct. 
A) binomial distribution 
B) Poisson distribution 
C) hypergeometric distribution 
D) None of the alternative answers is correct.

Question 5

A numerical measure from a population, such as a population mean, is called

Accepted Answer

A) a statistic 
B) a parameter 
C) a sample 
D) the mean deviation 
A) a statistic 
B) a parameter 
C) a sample 
D) the mean deviation

Question 6

A simple random sample of 5 observations from a population containing 400 elements was taken, and the following values were obtained.   A point estimate of the population mean is

Accepted Answer

A) 5 
B) 18 
C) 19 
D) 20 
A) 5 
B) 18 
C) 19 
D) 20

Question 7

A random sample of nine telephone calls in an office provided the following information.
   
a.Determine the point estimate for the average duration of all calls.
b.What is the point estimate for the standard deviation of the population?
c.What is the point estimate for the proportion of all calls that were long distance?

Accepted Answer

The answer of A random sample of nine telephone calls...

Question 8

In computing the standard error of the mean, the finite population correction factor is not used when

Accepted Answer

A) n/N F1F1F1S1F1F1F10 0.05 
B) N/n F1F1F1S1F1F1F10 0.05 
C) n/N F1F1F1S1F1F1F10 0.05 
D) n F1F1F1S1F1F1F10 30 
A) n/N F1F1F1S1F1F1F10 0.05 
B) N/n F1F1F1S1F1F1F10 0.05 
C) n/N F1F1F1S1F1F1F10 0.05 
D) n F1F1F1S1F1F1F10 30

Question 9

The mean diameter of a ball bearing produced by a certain manufacturer is 0.80 cm with a standard deviation of 0.03 cm. A sample of 36 ball bearings is randomly selected from a production run. Use Excel to answer the following questions.
a.What is the probability that the sample of ball bearings will have a mean less than 0.798 cm?
b.What is the probability that the sample of ball bearings will have a mean of at least 0.815 cm?
c.What is the probability that the sample of ball bearings will have a mean between 0.798 and 0.815 cm?
d.For samples of size 36, 15% of all sample means are at most what diameter?

Accepted Answer

a..344578
=NORM.DIST(0.798,0.8

Question 10

A simple random sample of 8 employees of a corporation provided the following information.
   
a.Determine the point estimate for the average age of all employees.
b.What is the point estimate for the standard deviation of the population?
c.Determine a point estimate for the proportion of all employees who are female.

Accepted Answer

The answer of A simple random sample of 8 employees...

Question 11

There are 6 children in a family. The number of children defines a population. The number of simple random samples of size 2 (without replacement) which are possible equals

Accepted Answer

A) 12 
B) 15 
C) 3 
D) 16 
A) 12 
B) 15 
C) 3 
D) 16

Question 12

A simple random sample of 64 observations was taken from a large population. The population standard deviation is 120. The sample mean was determined to be 320. The standard error of the mean is

Accepted Answer

A) 1.875 
B) 40 
C) 5 
D) 15 
A) 1.875 
B) 40 
C) 5 
D) 15

Question 13

The average lifetime of a light bulb is 3,000 hours with a standard deviation of 696 hours. A simple random sample of 36 bulbs is taken.
a.What are the expected value, standard deviation, and shape of the sampling distribution of?
b.What is the random variable in this problem? Define it in words.
c.What is the probability that the average life in the sample will be between 2,670.56 and 2,809.76 hours?
d.What is the probability that the average life in the sample will be greater than 3,219.24 hours?
e.What is the probability that the average life in the sample will be less than 3,180.96 hours?

Accepted Answer

a.3,000; 116; normal

Question 14

A numerical measure from a sample, such as a sample mean, is known as

Accepted Answer

A) a statistic 
B) a parameter 
C) the mean deviation 
D) the central limit theorem 
A) a statistic 
B) a parameter 
C) the mean deviation 
D) the central limit theorem

Question 15

The proportion of Americans who support the death penalty is 0.53. A sample of 1000 randomly selected Americans is surveyed by telephone interview. Use Excel to answer the following questions.
a.What is the probability that the sample proportion of those supporting the death penalty will be less than 0.50?
b.What is the probability that the sample proportion of those supporting the death penalty will be at least 0.55?
c.What is the probability that the sample proportion of those supporting the death penalty will be between 0.50 and 0.55?
d.For samples of size 1000, 15% of all sample proportions are at most what value?

Accepted Answer

a..028
=NORM.DIST(0.5,0.53,0.0

Question 16

Since the sample size is always smaller than the size of the population, the sample mean must

Accepted Answer

A) always be smaller than the population mean 
B) be larger than the population mean 
C) be equal to the population mean 
D) None of the alternative ANSWERS is correct. 
A) always be smaller than the population mean 
B) be larger than the population mean 
C) be equal to the population mean 
D) None of the alternative ANSWERS is correct.

Question 17

How many different samples of size 3 (without replacement) can be taken from a finite population of size 10?

Accepted Answer

A) 30 
B) 1,000 
C) 720 
D) 120 
A) 30 
B) 1,000 
C) 720 
D) 120

Question 18

The population we want to make inferences about is the

Accepted Answer

A) sampled population 
B) frame 
C) target population 
D) finite population 
A) sampled population 
B) frame 
C) target population 
D) finite population

Question 19

Which of the following is an example of a nonprobability sampling technique?

Accepted Answer

A) simple random sampling 
B) stratified random sampling 
C) cluster sampling 
D) judgment sampling 
A) simple random sampling 
B) stratified random sampling 
C) cluster sampling 
D) judgment sampling

Question 20

Exhibit 7-1
The following data was collected from a simple random sample from a process (an infinite population).
  
-Refer to Exhibit 7-1. The mean of the population

Accepted Answer

A) is 14 
B) is 15 
C) is 15.1581 
D) could be any value 
A) is 14 
B) is 15 
C) is 15.1581 
D) could be any value

Excel's RAND function

The purpose of statistical inference is to provide information about the

A random sample of 150 people was taken from a very large population. Ninety of the people in the sample were females. The standard error of the proportion of females is

As the sample size becomes larger, the sampling distribution of the sample mean approaches a

A numerical measure from a population, such as a population mean, is called

A simple random sample of 5 observations from a population containing 400 elements was taken, and the following values were obtained. A point estimate of the population mean is

In computing the standard error of the mean, the finite population correction factor is not used when

There are 6 children in a family. The number of children defines a population. The number of simple random samples of size 2 (without replacement) which are possible equals

A simple random sample of 64 observations was taken from a large population. The population standard deviation is 120. The sample mean was determined to be 320. The standard error of the mean is

A numerical measure from a sample, such as a sample mean, is known as

Since the sample size is always smaller than the size of the population, the sample mean must

How many different samples of size 3 (without replacement) can be taken from a finite population of size 10?

The population we want to make inferences about is the

Which of the following is an example of a nonprobability sampling technique?

Exhibit 7-1 The following data was collected from a simple random sample from a process (an infinite population). -Refer to Exhibit 7-1. The mean of the population

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Means, Experimental Design, and Analysis of Variance

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

Multiple Regression

Statistical Methods for Quality Control

Time Series Analysis and Forecastng

Filters

Exam 7: Sampling and Sampling Distributions

Excel's RAND function

The purpose of statistical inference is to provide information about the

A random sample of 150 people was taken from a very large population. Ninety of the people in the sample were females. The standard error of the proportion of females is

As the sample size becomes larger, the sampling distribution of the sample mean approaches a

A numerical measure from a population, such as a population mean, is called

A simple random sample of 5 observations from a population containing 400 elements was taken, and the following values were obtained. A point estimate of the population mean is

In computing the standard error of the mean, the finite population correction factor is not used when

There are 6 children in a family. The number of children defines a population. The number of simple random samples of size 2 (without replacement) which are possible equals

A simple random sample of 64 observations was taken from a large population. The population standard deviation is 120. The sample mean was determined to be 320. The standard error of the mean is

A numerical measure from a sample, such as a sample mean, is known as

Since the sample size is always smaller than the size of the population, the sample mean must

How many different samples of size 3 (without replacement) can be taken from a finite population of size 10?

The population we want to make inferences about is the

Which of the following is an example of a nonprobability sampling technique?

Exhibit 7-1 The following data was collected from a simple random sample from a process (an infinite population). -Refer to Exhibit 7-1. The mean of the population

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Means, Experimental Design, and Analysis of Variance

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

Multiple Regression

Statistical Methods for Quality Control

Time Series Analysis and Forecastng

Filters